diff --git a/build.gradle b/build.gradle
index 3e59600..3a450f4 100644
--- a/build.gradle
+++ b/build.gradle
@@ -57,6 +57,10 @@ dependencies {
 
     // AWS S3
     implementation 'org.springframework.cloud:spring-cloud-starter-aws:2.2.6.RELEASE'
+
+    // Image
+    implementation("com.sksamuel.scrimage:scrimage-core:4.3.5")
+    implementation("com.sksamuel.scrimage:scrimage-webp:4.3.5")
 }
 
 tasks.named('test') {
diff --git a/src/main/java/com/sku/refit/domain/event/controller/EventController.java b/src/main/java/com/sku/refit/domain/event/controller/EventController.java
new file mode 100644
index 0000000..5505622
--- /dev/null
+++ b/src/main/java/com/sku/refit/domain/event/controller/EventController.java
@@ -0,0 +1,101 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.event.controller;
+
+import java.util.List;
+
+import jakarta.validation.Valid;
+
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.multipart.MultipartFile;
+
+import com.sku.refit.domain.event.dto.request.EventRequest.*;
+import com.sku.refit.domain.event.dto.response.EventResponse.*;
+import com.sku.refit.global.response.BaseResponse;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.Parameter;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.tags.Tag;
+
+@Tag(name = "행사", description = "행사 관련 API")
+@RequestMapping("/api/events")
+public interface EventController {
+
+  /* =========================
+   * Admin
+   * ========================= */
+
+  @PostMapping(value = "/admin", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
+  @Operation(summary = "[관리자] 행사 생성", description = "행사를 생성합니다.")
+  ResponseEntity<BaseResponse<EventDetailResponse>> createEvent(
+      @Parameter(
+              description = "행사 정보",
+              content = @Content(mediaType = MediaType.APPLICATION_JSON_VALUE))
+          @RequestPart("request")
+          @Valid
+          EventInfoRequest request,
+      @Parameter(
+              description = "대표 사진(썸네일)",
+              content = @Content(mediaType = MediaType.MULTIPART_FORM_DATA_VALUE))
+          @RequestPart("thumbnail")
+          MultipartFile thumbnail);
+
+  @PutMapping(value = "/admin/{id}", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
+  @Operation(summary = "[관리자] 행사 수정", description = "행사를 수정합니다.")
+  ResponseEntity<BaseResponse<EventDetailResponse>> updateEvent(
+      @PathVariable Long id,
+      @RequestPart("request") @Valid EventInfoRequest request,
+      @RequestPart(value = "thumbnail", required = false) MultipartFile thumbnail);
+
+  @DeleteMapping("/admin/{id}")
+  @Operation(summary = "[관리자] 행사 삭제", description = "행사 뿐만 아니라 대표사진 및 이미지들까지 모두 삭제합니다.")
+  ResponseEntity<BaseResponse<Void>> deleteEvent(@PathVariable Long id);
+
+  /* =========================
+   * Public List
+   * ========================= */
+
+  @GetMapping("/upcoming")
+  @Operation(summary = "예정된 행사 리스트", description = "예정된 행사만 조회합니다. D-day가 가까운 순(오름차순)으로 정렬합니다.")
+  ResponseEntity<BaseResponse<List<EventCardResponse>>> getUpcomingEvents();
+
+  @GetMapping("/end")
+  @Operation(summary = "종료된 행사 리스트", description = "종료된 행사만 조회합니다. 최근 종료 순(내림차순)으로 정렬합니다.")
+  ResponseEntity<BaseResponse<List<EventSimpleResponse>>> getEndedEvents();
+
+  @GetMapping
+  @Operation(
+      summary = "다가오는/예정된/종료된 행사 조회",
+      description = "다가오는(가장 가까운 D-day 1개) / 예정된(그 다음 1개) / 종료된(가장 최근 종료 1개)로 반환합니다.")
+  ResponseEntity<BaseResponse<EventGroupResponse>> getEventGroups();
+
+  /* =========================
+   * Detail
+   * ========================= */
+
+  @GetMapping("/{id}")
+  @Operation(
+      summary = "행사 상세 조회",
+      description = "행사 예약 여부 + 행사 정보 + 최근 예약 이미지 4장 + 4장 제외 의류수를 반환합니다.")
+  ResponseEntity<BaseResponse<EventDetailResponse>> getEventDetail(@PathVariable Long id);
+
+  @GetMapping("/{id}/img")
+  @Operation(summary = "행사 더보기 이미지 조회", description = "해당 행사의 예약에서 업로드된 모든 옷 사진을 최신 등록순으로 반환합니다.")
+  ResponseEntity<BaseResponse<List<EventImageResponse>>> getEventAllReservationImages(
+      @PathVariable Long id);
+
+  /* =========================
+   * Reservation
+   * ========================= */
+
+  @PostMapping(value = "/{id}/rsv", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
+  @Operation(summary = "행사 예약", description = "예약 정보를 저장하고 업로드 이미지는 WebP로 저장합니다.")
+  ResponseEntity<BaseResponse<EventReservationResponse>> reserveEvent(
+      @PathVariable Long id,
+      @RequestPart("request") @Valid EventRsvRequest request,
+      @RequestPart(value = "clothImageList", required = false) List<MultipartFile> clothImageList);
+}
diff --git a/src/main/java/com/sku/refit/domain/event/controller/EventControllerImpl.java b/src/main/java/com/sku/refit/domain/event/controller/EventControllerImpl.java
new file mode 100644
index 0000000..49a4bf9
--- /dev/null
+++ b/src/main/java/com/sku/refit/domain/event/controller/EventControllerImpl.java
@@ -0,0 +1,97 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.event.controller;
+
+import java.util.List;
+
+import jakarta.validation.Valid;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestPart;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.multipart.MultipartFile;
+
+import com.sku.refit.domain.event.dto.request.EventRequest.EventInfoRequest;
+import com.sku.refit.domain.event.dto.request.EventRequest.EventRsvRequest;
+import com.sku.refit.domain.event.dto.response.EventResponse.EventCardResponse;
+import com.sku.refit.domain.event.dto.response.EventResponse.EventDetailResponse;
+import com.sku.refit.domain.event.dto.response.EventResponse.EventGroupResponse;
+import com.sku.refit.domain.event.dto.response.EventResponse.EventImageResponse;
+import com.sku.refit.domain.event.dto.response.EventResponse.EventReservationResponse;
+import com.sku.refit.domain.event.dto.response.EventResponse.EventSimpleResponse;
+import com.sku.refit.domain.event.service.EventService;
+import com.sku.refit.global.response.BaseResponse;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+@RestController
+@RequiredArgsConstructor
+@Slf4j
+public class EventControllerImpl implements EventController {
+
+  private final EventService eventService;
+
+  @Override
+  public ResponseEntity<BaseResponse<EventDetailResponse>> createEvent(
+      @RequestPart("request") @Valid EventInfoRequest request,
+      @RequestPart("thumbnail") MultipartFile thumbnail) {
+
+    return ResponseEntity.ok(BaseResponse.success(eventService.createEvent(request, thumbnail)));
+  }
+
+  @Override
+  public ResponseEntity<BaseResponse<EventDetailResponse>> updateEvent(
+      @PathVariable Long id,
+      @RequestPart("request") @Valid EventInfoRequest request,
+      @RequestPart(value = "thumbnail", required = false) MultipartFile thumbnail) {
+
+    return ResponseEntity.ok(
+        BaseResponse.success(eventService.updateEvent(id, request, thumbnail)));
+  }
+
+  @Override
+  public ResponseEntity<BaseResponse<Void>> deleteEvent(@PathVariable Long id) {
+    eventService.deleteEvent(id);
+    return ResponseEntity.ok(BaseResponse.success(null));
+  }
+
+  @Override
+  public ResponseEntity<BaseResponse<List<EventCardResponse>>> getUpcomingEvents() {
+    return ResponseEntity.ok(BaseResponse.success(eventService.getUpcomingEvents()));
+  }
+
+  @Override
+  public ResponseEntity<BaseResponse<List<EventSimpleResponse>>> getEndedEvents() {
+    return ResponseEntity.ok(BaseResponse.success(eventService.getEndedEvents()));
+  }
+
+  @Override
+  public ResponseEntity<BaseResponse<EventGroupResponse>> getEventGroups() {
+    return ResponseEntity.ok(BaseResponse.success(eventService.getEventGroups()));
+  }
+
+  @Override
+  public ResponseEntity<BaseResponse<EventDetailResponse>> getEventDetail(@PathVariable Long id) {
+    return ResponseEntity.ok(BaseResponse.success(eventService.getEventDetail(id)));
+  }
+
+  @Override
+  public ResponseEntity<BaseResponse<List<EventImageResponse>>> getEventAllReservationImages(
+      @PathVariable Long id) {
+
+    return ResponseEntity.ok(BaseResponse.success(eventService.getEventAllReservationImages(id)));
+  }
+
+  @Override
+  public ResponseEntity<BaseResponse<EventReservationResponse>> reserveEvent(
+      @PathVariable Long id,
+      @RequestPart("request") @Valid EventRsvRequest request,
+      @RequestPart(value = "clothImageList", required = false) List<MultipartFile> clothImageList) {
+
+    return ResponseEntity.ok(
+        BaseResponse.success(eventService.reserveEvent(id, request, clothImageList)));
+  }
+}
diff --git a/src/main/java/com/sku/refit/domain/event/dto/request/EventRequest.java b/src/main/java/com/sku/refit/domain/event/dto/request/EventRequest.java
new file mode 100644
index 0000000..2a188b3
--- /dev/null
+++ b/src/main/java/com/sku/refit/domain/event/dto/request/EventRequest.java
@@ -0,0 +1,68 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.event.dto.request;
+
+import java.time.LocalDate;
+
+import jakarta.validation.constraints.*;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.*;
+
+public class EventRequest {
+
+  @Getter
+  @Builder
+  @NoArgsConstructor
+  @AllArgsConstructor
+  @Schema(title = "EventInfoRequest DTO", description = "행사 생성 및 수정 요청 데이터")
+  public static class EventInfoRequest {
+
+    @NotBlank(message = "행사명은 필수입니다.")
+    @Schema(description = "행사명", example = "2025 21% 파티")
+    private String name;
+
+    @NotBlank(message = "행사 설명은 필수입니다.")
+    @Schema(description = "행사 설명", example = "파티에 대한 짧은 설명입니다.")
+    private String description;
+
+    @NotNull(message = "행사 날짜는 필수입니다.") @Schema(description = "행사 날짜", example = "2025-12-24")
+    private LocalDate date;
+
+    @NotBlank(message = "행사 장소는 필수입니다.")
+    @Schema(description = "행사 장소", example = "서울 성동구")
+    private String location;
+
+    @Schema(description = "행사 상세 링크", example = "https://wearagain.org/48")
+    private String detailLink;
+  }
+
+  @Getter
+  @Builder
+  @NoArgsConstructor
+  @AllArgsConstructor
+  @Schema(title = "EventRsvRequest DTO", description = "행사 예약 요청 데이터")
+  public static class EventRsvRequest {
+
+    @NotBlank(message = "예약자 이름은 필수입니다.")
+    @Schema(description = "예약자 이름", example = "김재생")
+    private String name;
+
+    @NotBlank(message = "연락처는 필수입니다.")
+    @Schema(description = "연락처", example = "010-1234-5678")
+    private String phone;
+
+    @Email(message = "이메일 형식이 올바르지 않습니다.")
+    @NotBlank(message = "이메일은 필수입니다.")
+    @Schema(description = "이메일", example = "test@example.com")
+    private String email;
+
+    @Min(value = 0, message = "옷 수량은 0 이상이어야 합니다.")
+    @Schema(description = "가져올 옷 수량", example = "3")
+    private Integer clothCount;
+
+    @NotNull(message = "수신 동의 여부는 필수입니다.") @Schema(description = "마케팅/알림 수신 동의 여부", example = "true")
+    private Boolean marketingConsent;
+  }
+}
diff --git a/src/main/java/com/sku/refit/domain/event/dto/response/EventResponse.java b/src/main/java/com/sku/refit/domain/event/dto/response/EventResponse.java
new file mode 100644
index 0000000..d11fba6
--- /dev/null
+++ b/src/main/java/com/sku/refit/domain/event/dto/response/EventResponse.java
@@ -0,0 +1,151 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.event.dto.response;
+
+import java.time.LocalDate;
+import java.util.List;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.*;
+
+@Schema(title = "EventResponse DTO", description = "행사 관련 응답 데이터")
+public class EventResponse {
+
+  @Getter
+  @Builder
+  @Schema(title = "EventDetailResponse DTO", description = "행사 상세 조회 응답")
+  public static class EventDetailResponse {
+
+    @Schema(description = "현재 사용자가 해당 행사를 이미 예약했는지 여부 (비로그인 시 null)", example = "true")
+    private Boolean isReserved;
+
+    /* ===== 상단 ===== */
+
+    @Schema(description = "행사 식별자", example = "1")
+    private Long eventId;
+
+    @Schema(description = "누적 예약 인원(옷 수량 기준)", example = "25")
+    private Integer totalReservedCount;
+
+    @Schema(description = "행사 대표 이미지 URL")
+    private String thumbnailUrl;
+
+    @Schema(description = "행사명", example = "겨울 의류 나눔 행사")
+    private String name;
+
+    @Schema(description = "행사 설명", example = "따뜻한 겨울을 위한 의류 기부 행사입니다.")
+    private String description;
+
+    @Schema(description = "행사 상세 링크", example = "https://example.com/events/1")
+    private String detailLink;
+
+    /* ===== 중간 ===== */
+
+    @Schema(description = "행사 날짜", example = "2025-12-24")
+    private LocalDate date;
+
+    @Schema(description = "행사 장소", example = "서울 성동구")
+    private String location;
+
+    /* ===== 하단 ===== */
+
+    @Schema(description = "최근 등록된 예약 이미지 4장 URL 리스트")
+    private List<String> recentImageUrlList;
+
+    @Schema(description = "최근 4장을 제외한 의류 수량", example = "21")
+    private Integer clothCountExceptRecent4;
+  }
+
+  @Getter
+  @Builder
+  @Schema(title = "EventImageResponse DTO", description = "행사 예약 이미지 응답")
+  public static class EventImageResponse {
+
+    @Schema(description = "이미지 정렬 순서(ID 기준 최신순)", example = "15")
+    private Long order;
+
+    @Schema(description = "이미지 URL")
+    private String imageUrl;
+  }
+
+  @Getter
+  @Builder
+  @Schema(title = "EventReservationResponse DTO", description = "행사 예약 결과 응답")
+  public static class EventReservationResponse {
+
+    @Schema(description = "행사 식별자", example = "1")
+    private Long eventId;
+
+    @Schema(description = "예약 완료 여부", example = "true")
+    private Boolean reserved;
+
+    @Schema(description = "예약 완료 후 누적 예약 인원", example = "28")
+    private Integer totalReservedCount;
+  }
+
+  /* ===== 리스트용 ===== */
+
+  @Getter
+  @Builder
+  @Schema(title = "EventCardResponse DTO", description = "다가오는 행사 카드형 응답")
+  public static class EventCardResponse {
+
+    @Schema(description = "행사 식별자", example = "1")
+    private Long eventId;
+
+    @Schema(description = "행사 대표 이미지 URL")
+    private String thumbnailUrl;
+
+    @Schema(description = "D-day (행사까지 남은 일 수)", example = "5")
+    private Long dday;
+
+    @Schema(description = "행사명", example = "겨울 의류 나눔 행사")
+    private String name;
+
+    @Schema(description = "행사 설명", example = "따뜻한 겨울을 위한 의류 기부 행사입니다.")
+    private String description;
+
+    @Schema(description = "행사 날짜", example = "2025-12-24")
+    private LocalDate date;
+
+    @Schema(description = "행사 장소", example = "서울 성동구")
+    private String location;
+  }
+
+  @Getter
+  @Builder
+  @Schema(title = "EventSimpleResponse DTO", description = "예정/종료 행사 간단 응답")
+  public static class EventSimpleResponse {
+
+    @Schema(description = "행사 식별자", example = "1")
+    private Long eventId;
+
+    @Schema(description = "행사 대표 이미지 URL")
+    private String thumbnailUrl;
+
+    @Schema(description = "행사명", example = "겨울 의류 나눔 행사")
+    private String name;
+
+    @Schema(description = "행사 날짜", example = "2025-12-24")
+    private LocalDate date;
+
+    @Schema(description = "행사 장소", example = "서울 성동구")
+    private String location;
+  }
+
+  @Getter
+  @Builder
+  @Schema(title = "EventGroupResponse DTO", description = "행사 분류별 리스트 응답")
+  public static class EventGroupResponse {
+
+    @Schema(description = "다가오는 행사")
+    private EventCardResponse upcoming;
+
+    @Schema(description = "예정된 행사")
+    private EventSimpleResponse scheduled;
+
+    @Schema(description = "종료된 행사")
+    private EventSimpleResponse ended;
+  }
+}
diff --git a/src/main/java/com/sku/refit/domain/event/entity/Event.java b/src/main/java/com/sku/refit/domain/event/entity/Event.java
new file mode 100644
index 0000000..c343597
--- /dev/null
+++ b/src/main/java/com/sku/refit/domain/event/entity/Event.java
@@ -0,0 +1,67 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.event.entity;
+
+import java.time.LocalDate;
+
+import jakarta.persistence.*;
+
+import com.sku.refit.global.common.BaseTimeEntity;
+
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Getter
+@Builder
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+@Table(name = "event")
+public class Event extends BaseTimeEntity {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  private Long id;
+
+  @Column(nullable = false)
+  private String name;
+
+  @Column(nullable = false, columnDefinition = "TEXT")
+  private String description;
+
+  @Column(nullable = false)
+  private LocalDate date;
+
+  @Column(nullable = false)
+  private String location;
+
+  @Column private String detailLink;
+
+  @Column(nullable = false)
+  private String thumbnailUrl;
+
+  @Column(nullable = false)
+  @Builder.Default
+  private Integer totalReservedCount = 0;
+
+  public void update(
+      String name, String description, LocalDate date, String location, String detailLink) {
+    this.name = name;
+    this.description = description;
+    this.date = date;
+    this.location = location;
+    this.detailLink = detailLink;
+  }
+
+  public void updateThumbnailUrl(String thumbnailUrl) {
+    this.thumbnailUrl = thumbnailUrl;
+  }
+
+  public void increaseReservedCount() {
+    this.totalReservedCount = (this.totalReservedCount == null ? 0 : this.totalReservedCount) + 1;
+  }
+}
diff --git a/src/main/java/com/sku/refit/domain/event/entity/EventReservation.java b/src/main/java/com/sku/refit/domain/event/entity/EventReservation.java
new file mode 100644
index 0000000..6898072
--- /dev/null
+++ b/src/main/java/com/sku/refit/domain/event/entity/EventReservation.java
@@ -0,0 +1,54 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.event.entity;
+
+import jakarta.persistence.*;
+
+import com.sku.refit.domain.user.entity.User;
+import com.sku.refit.global.common.BaseTimeEntity;
+
+import lombok.*;
+
+@Entity
+@Getter
+@Builder
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+@Table(
+    name = "event_reservation",
+    uniqueConstraints = {
+      @UniqueConstraint(
+          name = "uk_event_user",
+          columnNames = {"event_id", "user_id"})
+    })
+public class EventReservation extends BaseTimeEntity {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  private Long id;
+
+  @ManyToOne(fetch = FetchType.LAZY)
+  @JoinColumn(name = "event_id", nullable = false)
+  private Event event;
+
+  @ManyToOne(fetch = FetchType.LAZY)
+  @JoinColumn(name = "user_id", nullable = false)
+  private User user;
+
+  @Column(nullable = false)
+  private String name;
+
+  @Column(nullable = false)
+  private String phone;
+
+  @Column(nullable = false)
+  private String email;
+
+  @Column(nullable = false)
+  @Builder.Default
+  private Integer clothCount = 0;
+
+  @Column(nullable = false)
+  private Boolean marketingConsent;
+}
diff --git a/src/main/java/com/sku/refit/domain/event/entity/EventReservationImage.java b/src/main/java/com/sku/refit/domain/event/entity/EventReservationImage.java
new file mode 100644
index 0000000..14b484d
--- /dev/null
+++ b/src/main/java/com/sku/refit/domain/event/entity/EventReservationImage.java
@@ -0,0 +1,42 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.event.entity;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+
+import com.sku.refit.global.common.BaseTimeEntity;
+
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Getter
+@Builder
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor
+@Table(name = "event_reservation_image")
+public class EventReservationImage extends BaseTimeEntity {
+
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  private Long id;
+
+  @ManyToOne(fetch = FetchType.LAZY)
+  @JoinColumn(name = "reservation_id", nullable = false)
+  private EventReservation reservation;
+
+  @Column(nullable = false)
+  private String imageUrl;
+}
diff --git a/src/main/java/com/sku/refit/domain/event/exception/EventErrorCode.java b/src/main/java/com/sku/refit/domain/event/exception/EventErrorCode.java
new file mode 100644
index 0000000..c1d63af
--- /dev/null
+++ b/src/main/java/com/sku/refit/domain/event/exception/EventErrorCode.java
@@ -0,0 +1,41 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.event.exception;
+
+import org.springframework.http.HttpStatus;
+
+import com.sku.refit.global.exception.model.BaseErrorCode;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public enum EventErrorCode implements BaseErrorCode {
+  EVENT_NOT_FOUND("EVENT001", "행사가 존재하지 않습니다.", HttpStatus.NOT_FOUND),
+
+  EVENT_THUMBNAIL_REQUIRED("EVENT010", "행사 대표 사진은 필수입니다.", HttpStatus.BAD_REQUEST),
+  EVENT_THUMBNAIL_UPLOAD_FAILED(
+      "EVENT011", "행사 대표 사진 업로드에 실패했습니다.", HttpStatus.INTERNAL_SERVER_ERROR),
+  EVENT_THUMBNAIL_DELETE_FAILED(
+      "EVENT012", "행사 대표 사진 삭제에 실패했습니다.", HttpStatus.INTERNAL_SERVER_ERROR),
+
+  EVENT_CREATE_FAILED("EVENT013", "행사 생성에 실패했습니다.", HttpStatus.INTERNAL_SERVER_ERROR),
+  EVENT_UPDATE_FAILED("EVENT014", "행사 수정에 실패했습니다.", HttpStatus.INTERNAL_SERVER_ERROR),
+
+  EVENT_DELETE_FAILED("EVENT015", "행사 삭제에 실패했습니다.", HttpStatus.INTERNAL_SERVER_ERROR),
+  EVENT_RESERVATION_IMAGES_DELETE_FAILED(
+      "EVENT016", "예약 이미지 삭제에 실패했습니다.", HttpStatus.INTERNAL_SERVER_ERROR),
+
+  EVENT_ALREADY_RESERVED("EVENT020", "이미 예약한 행사입니다.", HttpStatus.CONFLICT),
+  EVENT_RESERVATION_CREATE_FAILED(
+      "EVENT021", "행사 예약 저장에 실패했습니다.", HttpStatus.INTERNAL_SERVER_ERROR),
+  EVENT_RESERVATION_IMAGE_UPLOAD_FAILED(
+      "EVENT022", "예약 이미지 업로드에 실패했습니다.", HttpStatus.INTERNAL_SERVER_ERROR),
+  ;
+
+  private final String code;
+  private final String message;
+  private final HttpStatus status;
+}
diff --git a/src/main/java/com/sku/refit/domain/event/mapper/EventMapper.java b/src/main/java/com/sku/refit/domain/event/mapper/EventMapper.java
new file mode 100644
index 0000000..3d86911
--- /dev/null
+++ b/src/main/java/com/sku/refit/domain/event/mapper/EventMapper.java
@@ -0,0 +1,121 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.event.mapper;
+
+import java.time.LocalDate;
+import java.time.temporal.ChronoUnit;
+import java.util.List;
+
+import org.springframework.stereotype.Component;
+
+import com.sku.refit.domain.event.dto.request.EventRequest.*;
+import com.sku.refit.domain.event.dto.response.EventResponse.*;
+import com.sku.refit.domain.event.entity.Event;
+import com.sku.refit.domain.event.entity.EventReservation;
+import com.sku.refit.domain.event.entity.EventReservationImage;
+import com.sku.refit.domain.user.entity.User;
+
+@Component
+public class EventMapper {
+
+  public Event toEvent(EventInfoRequest req, String thumbnailUrl) {
+    return Event.builder()
+        .name(req.getName())
+        .description(req.getDescription())
+        .date(req.getDate())
+        .location(req.getLocation())
+        .detailLink(req.getDetailLink())
+        .thumbnailUrl(thumbnailUrl)
+        .totalReservedCount(0)
+        .build();
+  }
+
+  public EventDetailResponse toDetail(
+      Event event, Boolean isReserved, List<String> recent4, int clothCountExcept4) {
+    return EventDetailResponse.builder()
+        .isReserved(isReserved)
+        .eventId(event.getId())
+        .totalReservedCount(event.getTotalReservedCount())
+        .thumbnailUrl(event.getThumbnailUrl())
+        .name(event.getName())
+        .description(event.getDescription())
+        .detailLink(event.getDetailLink())
+        .date(event.getDate())
+        .location(event.getLocation())
+        .recentImageUrlList(recent4)
+        .clothCountExceptRecent4(clothCountExcept4)
+        .build();
+  }
+
+  public EventImageResponse toImageResponse(EventReservationImage img) {
+    return EventImageResponse.builder().order(img.getId()).imageUrl(img.getImageUrl()).build();
+  }
+
+  /* =========================
+   * List Responses
+   * ========================= */
+
+  public EventCardResponse toUpcomingCard(Event event, LocalDate today) {
+    long dday = ChronoUnit.DAYS.between(today, event.getDate());
+    return EventCardResponse.builder()
+        .eventId(event.getId())
+        .thumbnailUrl(event.getThumbnailUrl())
+        .dday(dday)
+        .name(event.getName())
+        .description(event.getDescription())
+        .date(event.getDate())
+        .location(event.getLocation())
+        .build();
+  }
+
+  public EventSimpleResponse toSimple(Event event) {
+    return EventSimpleResponse.builder()
+        .eventId(event.getId())
+        .thumbnailUrl(event.getThumbnailUrl())
+        .name(event.getName())
+        .date(event.getDate())
+        .location(event.getLocation())
+        .build();
+  }
+
+  public List<EventCardResponse> toUpcomingCardList(List<Event> events, LocalDate today) {
+    return events.stream().map(e -> toUpcomingCard(e, today)).toList();
+  }
+
+  public List<EventSimpleResponse> toSimpleList(List<Event> events) {
+    return events.stream().map(this::toSimple).toList();
+  }
+
+  public EventGroupResponse toGroupResponseSingle(
+      EventCardResponse upcoming, EventSimpleResponse scheduled, EventSimpleResponse ended) {
+    return EventGroupResponse.builder()
+        .upcoming(upcoming)
+        .scheduled(scheduled)
+        .ended(ended)
+        .build();
+  }
+
+  /* =========================
+   * Reservation Response
+   * ========================= */
+  public EventReservation toReservation(Event event, User user, EventRsvRequest request) {
+    return EventReservation.builder()
+        .event(event)
+        .user(user)
+        .name(request.getName())
+        .phone(request.getPhone())
+        .email(request.getEmail())
+        .clothCount(request.getClothCount() == null ? 0 : request.getClothCount())
+        .marketingConsent(request.getMarketingConsent())
+        .build();
+  }
+
+  public EventReservationResponse toReservationResponse(Event event) {
+    return EventReservationResponse.builder()
+        .eventId(event.getId())
+        .reserved(true)
+        .totalReservedCount(event.getTotalReservedCount())
+        .build();
+  }
+}
diff --git a/src/main/java/com/sku/refit/domain/event/repository/EventRepository.java b/src/main/java/com/sku/refit/domain/event/repository/EventRepository.java
new file mode 100644
index 0000000..75649b1
--- /dev/null
+++ b/src/main/java/com/sku/refit/domain/event/repository/EventRepository.java
@@ -0,0 +1,22 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.event.repository;
+
+import java.time.LocalDate;
+import java.util.List;
+
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.sku.refit.domain.event.entity.Event;
+
+public interface EventRepository extends JpaRepository<Event, Long> {
+  List<Event> findByDateGreaterThanEqualOrderByDateAsc(LocalDate today);
+
+  List<Event> findByDateLessThanOrderByDateDesc(LocalDate today);
+
+  List<Event> findByDateGreaterThanEqualOrderByDateAsc(LocalDate date, Pageable pageable);
+
+  List<Event> findByDateLessThanOrderByDateDesc(LocalDate date, Pageable pageable);
+}
diff --git a/src/main/java/com/sku/refit/domain/event/repository/EventReservationImageRepository.java b/src/main/java/com/sku/refit/domain/event/repository/EventReservationImageRepository.java
new file mode 100644
index 0000000..23d73a2
--- /dev/null
+++ b/src/main/java/com/sku/refit/domain/event/repository/EventReservationImageRepository.java
@@ -0,0 +1,20 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.event.repository;
+
+import java.util.List;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.sku.refit.domain.event.entity.EventReservationImage;
+
+public interface EventReservationImageRepository
+    extends JpaRepository<EventReservationImage, Long> {
+
+  List<EventReservationImage> findTop4ByReservation_Event_IdOrderByIdDesc(Long eventId);
+
+  int countByReservation_Event_Id(Long eventId);
+
+  List<EventReservationImage> findAllByReservation_Event_IdOrderByIdDesc(Long eventId);
+}
diff --git a/src/main/java/com/sku/refit/domain/event/repository/EventReservationRepository.java b/src/main/java/com/sku/refit/domain/event/repository/EventReservationRepository.java
new file mode 100644
index 0000000..325902c
--- /dev/null
+++ b/src/main/java/com/sku/refit/domain/event/repository/EventReservationRepository.java
@@ -0,0 +1,17 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.event.repository;
+
+import java.util.List;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.sku.refit.domain.event.entity.EventReservation;
+
+public interface EventReservationRepository extends JpaRepository<EventReservation, Long> {
+
+  boolean existsByEventIdAndUserId(Long eventId, Long userId);
+
+  List<EventReservation> findByEventId(Long eventId);
+}
diff --git a/src/main/java/com/sku/refit/domain/event/service/EventService.java b/src/main/java/com/sku/refit/domain/event/service/EventService.java
new file mode 100644
index 0000000..8b1acf6
--- /dev/null
+++ b/src/main/java/com/sku/refit/domain/event/service/EventService.java
@@ -0,0 +1,160 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.event.service;
+
+import java.util.List;
+
+import org.springframework.web.multipart.MultipartFile;
+
+import com.sku.refit.domain.event.dto.request.EventRequest.*;
+import com.sku.refit.domain.event.dto.response.EventResponse.*;
+
+/**
+ * 행사(Event) 관련 주요 기능을 제공하는 서비스 인터페이스입니다.
+ *
+ * <p>주요 기능:
+ *
+ * <ul>
+ *   <li>행사 생성 / 수정 / 삭제 (관리자)
+ *   <li>행사 목록 조회 (예정 / 종료 / 그룹)
+ *   <li>행사 상세 조회
+ *   <li>행사 예약 및 예약 이미지 업로드
+ *   <li>행사 예약 이미지 전체 조회
+ * </ul>
+ */
+public interface EventService {
+
+  /* =========================
+   * Admin
+   * ========================= */
+
+  /**
+   * 새로운 행사를 생성합니다. (관리자 전용)
+   *
+   * <p>대표 사진은 WebP 포맷으로 변환되어 S3에 저장됩니다.
+   *
+   * @param request 행사 기본 정보 (행사명, 설명, 날짜, 장소, 상세 링크)
+   * @param thumbnail 행사 대표 이미지
+   * @return 생성된 행사 상세 응답
+   */
+  EventDetailResponse createEvent(EventInfoRequest request, MultipartFile thumbnail);
+
+  /**
+   * 기존 행사를 수정합니다. (관리자 전용)
+   *
+   * <p>대표 이미지를 함께 전달할 경우 기존 이미지는 삭제되고 새 이미지로 교체됩니다.
+   *
+   * @param id 수정할 행사 ID
+   * @param request 수정할 행사 정보
+   * @param thumbnail 새 대표 이미지 (선택)
+   * @return 수정된 행사 상세 응답
+   */
+  EventDetailResponse updateEvent(Long id, EventInfoRequest request, MultipartFile thumbnail);
+
+  /**
+   * 행사를 삭제합니다. (관리자 전용)
+   *
+   * <p>대표 이미지 및 해당 행사에 등록된 모든 예약 이미지가 함께 삭제됩니다.
+   *
+   * @param id 삭제할 행사 ID
+   */
+  void deleteEvent(Long id);
+
+  /* =========================
+   * List
+   * ========================= */
+
+  /**
+   * 예정된 행사 목록을 조회합니다.
+   *
+   * <p>행사 날짜 기준 오름차순으로 정렬되며, D-Day 정보가 포함된 카드 형태의 응답을 반환합니다.
+   *
+   * @return 예정된 행사 카드 응답 리스트
+   */
+  List<EventCardResponse> getUpcomingEvents();
+
+  /**
+   * 종료된 행사 목록을 조회합니다.
+   *
+   * <p>행사 날짜 기준 내림차순으로 정렬되며, 간단한 행사 정보 형태의 응답을 반환합니다.
+   *
+   * @return 종료된 행사 간단 응답 리스트
+   */
+  List<EventSimpleResponse> getEndedEvents();
+
+  /**
+   * 행사 목록을 그룹 형태로 조회합니다.
+   *
+   * <p>응답은 다음 세 그룹으로 구성됩니다.
+   *
+   * <ul>
+   *   <li>다가오는 행사 (카드 형태, D-Day 포함)
+   *   <li>예정된 행사 (간단 정보 형태)
+   *   <li>종료된 행사 (간단 정보 형태)
+   * </ul>
+   *
+   * @return 행사 그룹 응답
+   */
+  EventGroupResponse getEventGroups();
+
+  /* =========================
+   * Detail
+   * ========================= */
+
+  /**
+   * 특정 행사에 대한 상세 정보를 조회합니다.
+   *
+   * <p>로그인 상태인 경우, 사용자의 해당 행사 예약 여부가 함께 반환됩니다. 비로그인 상태인 경우 예약 여부는 {@code null}로 반환됩니다.
+   *
+   * <p>상세 응답에는 다음 정보가 포함됩니다.
+   *
+   * <ul>
+   *   <li>누적 예약 인원
+   *   <li>대표 이미지, 행사명, 설명, 상세 링크
+   *   <li>행사 날짜 및 장소
+   *   <li>최근 등록된 예약 이미지 4장
+   *   <li>최근 4장을 제외한 의류 수량
+   * </ul>
+   *
+   * @param id 조회할 행사 ID
+   * @return 행사 상세 응답
+   */
+  EventDetailResponse getEventDetail(Long id);
+
+  /**
+   * 특정 행사에 등록된 모든 예약 이미지를 조회합니다.
+   *
+   * <p>이미지는 최신 등록 순으로 반환되며, 페이징 없이 전체 이미지를 조회합니다.
+   *
+   * @param eventId 행사 ID
+   * @return 행사 예약 이미지 응답 리스트
+   */
+  List<EventImageResponse> getEventAllReservationImages(Long eventId);
+
+  /* =========================
+   * Reservation
+   * ========================= */
+
+  /**
+   * 특정 행사에 대해 예약을 진행합니다.
+   *
+   * <p>예약 시 다음 정보가 함께 저장됩니다.
+   *
+   * <ul>
+   *   <li>예약자 정보 (이름, 연락처, 이메일)
+   *   <li>의류 수량
+   *   <li>마케팅 수신 동의 여부
+   *   <li>행사에 가져올 의류 이미지 (WebP 변환 후 저장)
+   * </ul>
+   *
+   * <p>예약이 완료되면 행사 누적 예약 수량이 증가합니다.
+   *
+   * @param eventId 예약할 행사 ID
+   * @param request 예약 요청 정보
+   * @param clothImageList 예약 시 업로드하는 의류 이미지 목록
+   * @return 행사 예약 결과 응답
+   */
+  EventReservationResponse reserveEvent(
+      Long eventId, EventRsvRequest request, List<MultipartFile> clothImageList);
+}
diff --git a/src/main/java/com/sku/refit/domain/event/service/EventServiceImpl.java b/src/main/java/com/sku/refit/domain/event/service/EventServiceImpl.java
new file mode 100644
index 0000000..8d253c5
--- /dev/null
+++ b/src/main/java/com/sku/refit/domain/event/service/EventServiceImpl.java
@@ -0,0 +1,332 @@
+/* 
+ * Copyright (c) SKU 다시입을Lab 
+ */
+package com.sku.refit.domain.event.service;
+
+import java.time.LocalDate;
+import java.util.List;
+
+import org.springframework.data.domain.PageRequest;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.web.multipart.MultipartFile;
+
+import com.sku.refit.domain.event.dto.request.EventRequest.*;
+import com.sku.refit.domain.event.dto.response.EventResponse.*;
+import com.sku.refit.domain.event.entity.Event;
+import com.sku.refit.domain.event.entity.EventReservation;
+import com.sku.refit.domain.event.entity.EventReservationImage;
+import com.sku.refit.domain.event.exception.EventErrorCode;
+import com.sku.refit.domain.event.mapper.EventMapper;
+import com.sku.refit.domain.event.repository.EventRepository;
+import com.sku.refit.domain.event.repository.EventReservationImageRepository;
+import com.sku.refit.domain.event.repository.EventReservationRepository;
+import com.sku.refit.domain.user.entity.User;
+import com.sku.refit.domain.user.service.UserService;
+import com.sku.refit.global.exception.CustomException;
+import com.sku.refit.global.s3.entity.PathName;
+import com.sku.refit.global.s3.service.S3Service;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+@Service
+@RequiredArgsConstructor
+@Slf4j
+@Transactional(readOnly = true)
+public class EventServiceImpl implements EventService {
+
+  private final EventRepository eventRepository;
+  private final EventReservationRepository eventReservationRepository;
+  private final EventReservationImageRepository eventReservationImageRepository;
+
+  private final S3Service s3Service;
+  private final UserService userService;
+  private final EventMapper eventMapper;
+
+  /* =========================
+   * Admin
+   * ========================= */
+
+  @Override
+  @Transactional
+  public EventDetailResponse createEvent(EventInfoRequest request, MultipartFile thumbnail) {
+
+    if (thumbnail == null || thumbnail.isEmpty()) {
+      throw new CustomException(EventErrorCode.EVENT_THUMBNAIL_REQUIRED);
+    }
+
+    String thumbnailUrl;
+    try {
+      thumbnailUrl = s3Service.uploadFileAsWebp(PathName.EVENT, thumbnail);
+    } catch (CustomException e) {
+      throw e;
+    } catch (Exception e) {
+      log.error("[EVENT] createEvent - thumbnail upload failed", e);
+      throw new CustomException(EventErrorCode.EVENT_THUMBNAIL_UPLOAD_FAILED);
+    }
+
+    try {
+      Event event = eventMapper.toEvent(request, thumbnailUrl);
+      eventRepository.save(event);
+      return getEventDetail(event.getId());
+
+    } catch (CustomException e) {
+      throw e;
+    } catch (Exception e) {
+      log.error("[EVENT] createEvent - failed", e);
+      throw new CustomException(EventErrorCode.EVENT_CREATE_FAILED);
+    }
+  }
+
+  @Override
+  @Transactional
+  public EventDetailResponse updateEvent(
+      Long id, EventInfoRequest request, MultipartFile thumbnail) {
+
+    Event event =
+        eventRepository
+            .findById(id)
+            .orElseThrow(() -> new CustomException(EventErrorCode.EVENT_NOT_FOUND));
+
+    try {
+      event.update(
+          request.getName(),
+          request.getDescription(),
+          request.getDate(),
+          request.getLocation(),
+          request.getDetailLink());
+
+      if (thumbnail != null && !thumbnail.isEmpty()) {
+        replaceThumbnail(event, id, thumbnail);
+      }
+
+      return getEventDetail(event.getId());
+
+    } catch (CustomException e) {
+      throw e;
+    } catch (Exception e) {
+      log.error("[EVENT] updateEvent - failed, eventId={}", id, e);
+      throw new CustomException(EventErrorCode.EVENT_UPDATE_FAILED);
+    }
+  }
+
+  private void replaceThumbnail(Event event, Long eventId, MultipartFile thumbnail) {
+    String oldThumbUrl = event.getThumbnailUrl();
+
+    final String newThumbUrl;
+    try {
+      newThumbUrl = s3Service.uploadFileAsWebp(PathName.EVENT, thumbnail);
+    } catch (Exception e) {
+      log.error("[EVENT] updateEvent - thumbnail upload failed, eventId={}", eventId, e);
+      throw new CustomException(EventErrorCode.EVENT_THUMBNAIL_UPLOAD_FAILED);
+    }
+
+    event.updateThumbnailUrl(newThumbUrl);
+
+    if (oldThumbUrl != null) {
+      try {
+        s3Service.deleteFile(s3Service.extractKeyNameFromUrl(oldThumbUrl));
+      } catch (Exception e) {
+        log.error("[EVENT] updateEvent - thumbnail delete failed, eventId={}", eventId, e);
+        throw new CustomException(EventErrorCode.EVENT_THUMBNAIL_DELETE_FAILED);
+      }
+    }
+  }
+
+  @Override
+  @Transactional
+  public void deleteEvent(Long id) {
+
+    Event event =
+        eventRepository
+            .findById(id)
+            .orElseThrow(() -> new CustomException(EventErrorCode.EVENT_NOT_FOUND));
+
+    try {
+      if (event.getThumbnailUrl() != null) {
+        try {
+          s3Service.deleteFile(s3Service.extractKeyNameFromUrl(event.getThumbnailUrl()));
+        } catch (CustomException e) {
+          throw e;
+        } catch (Exception e) {
+          log.error("[EVENT] deleteEvent - thumbnail delete failed, eventId={}", id, e);
+          throw new CustomException(EventErrorCode.EVENT_THUMBNAIL_DELETE_FAILED);
+        }
+      }
+      List<EventReservationImage> images =
+          eventReservationImageRepository.findAllByReservation_Event_IdOrderByIdDesc(id);
+
+      for (EventReservationImage img : images) {
+        try {
+          s3Service.deleteFile(s3Service.extractKeyNameFromUrl(img.getImageUrl()));
+        } catch (CustomException e) {
+          throw e;
+        } catch (Exception e) {
+          log.error(
+              "[EVENT] deleteEvent - reservation image delete failed, eventId={}, imageId={}",
+              id,
+              img.getId(),
+              e);
+          throw new CustomException(EventErrorCode.EVENT_RESERVATION_IMAGES_DELETE_FAILED);
+        }
+      }
+
+      eventReservationImageRepository.deleteAll(images);
+
+      List<EventReservation> reservations = eventReservationRepository.findByEventId(id);
+      eventReservationRepository.deleteAll(reservations);
+
+      eventRepository.delete(event);
+
+    } catch (CustomException e) {
+      throw e;
+    } catch (Exception e) {
+      log.error("[EVENT] deleteEvent - failed, eventId={}", id, e);
+      throw new CustomException(EventErrorCode.EVENT_DELETE_FAILED);
+    }
+  }
+
+  /* =========================
+   * List
+   * ========================= */
+
+  @Override
+  public List<EventCardResponse> getUpcomingEvents() {
+
+    LocalDate today = LocalDate.now();
+    List<Event> upcoming = eventRepository.findByDateGreaterThanEqualOrderByDateAsc(today);
+
+    return eventMapper.toUpcomingCardList(upcoming, today);
+  }
+
+  @Override
+  public List<EventSimpleResponse> getEndedEvents() {
+
+    LocalDate today = LocalDate.now();
+    List<Event> ended = eventRepository.findByDateLessThanOrderByDateDesc(today);
+
+    return eventMapper.toSimpleList(ended);
+  }
+
+  @Override
+  public EventGroupResponse getEventGroups() {
+    LocalDate today = LocalDate.now();
+
+    List<Event> top2Upcoming =
+        eventRepository.findByDateGreaterThanEqualOrderByDateAsc(today, PageRequest.of(0, 2));
+
+    Event upcomingEvent = top2Upcoming.size() >= 1 ? top2Upcoming.get(0) : null;
+    Event scheduledEvent = top2Upcoming.size() >= 2 ? top2Upcoming.get(1) : null;
+
+    Event endedEvent =
+        eventRepository.findByDateLessThanOrderByDateDesc(today, PageRequest.of(0, 1)).stream()
+            .findFirst()
+            .orElse(null);
+
+    EventCardResponse upcoming =
+        (upcomingEvent == null) ? null : eventMapper.toUpcomingCard(upcomingEvent, today);
+
+    EventSimpleResponse scheduled =
+        (scheduledEvent == null) ? null : eventMapper.toSimple(scheduledEvent);
+
+    EventSimpleResponse ended = (endedEvent == null) ? null : eventMapper.toSimple(endedEvent);
+
+    return eventMapper.toGroupResponseSingle(upcoming, scheduled, ended);
+  }
+
+  /* =========================
+   * Detail
+   * ========================= */
+
+  @Override
+  public EventDetailResponse getEventDetail(Long id) {
+
+    Event event =
+        eventRepository
+            .findById(id)
+            .orElseThrow(() -> new CustomException(EventErrorCode.EVENT_NOT_FOUND));
+
+    User user = null;
+    try {
+      user = userService.getCurrentUser();
+    } catch (Exception e) {
+      log.debug("[EVENT] getEventDetail - unauthenticated request");
+    }
+
+    Boolean isReserved = null;
+    if (user != null) {
+      isReserved = eventReservationRepository.existsByEventIdAndUserId(id, user.getId());
+    }
+
+    List<String> recent4 =
+        eventReservationImageRepository.findTop4ByReservation_Event_IdOrderByIdDesc(id).stream()
+            .map(EventReservationImage::getImageUrl)
+            .toList();
+
+    int totalUploadedClothCount = eventReservationImageRepository.countByReservation_Event_Id(id);
+
+    int clothCountExcept4 = Math.max(0, totalUploadedClothCount - 4);
+
+    return eventMapper.toDetail(event, isReserved, recent4, clothCountExcept4);
+  }
+
+  @Override
+  public List<EventImageResponse> getEventAllReservationImages(Long eventId) {
+
+    eventRepository
+        .findById(eventId)
+        .orElseThrow(() -> new CustomException(EventErrorCode.EVENT_NOT_FOUND));
+
+    return eventReservationImageRepository
+        .findAllByReservation_Event_IdOrderByIdDesc(eventId)
+        .stream()
+        .map(eventMapper::toImageResponse)
+        .toList();
+  }
+
+  /* =========================
+   * Reservation
+   * ========================= */
+
+  @Override
+  @Transactional
+  public EventReservationResponse reserveEvent(
+      Long eventId, EventRsvRequest request, List<MultipartFile> clothImageList) {
+
+    Event event =
+        eventRepository
+            .findById(eventId)
+            .orElseThrow(() -> new CustomException(EventErrorCode.EVENT_NOT_FOUND));
+
+    User user = userService.getCurrentUser();
+
+    if (eventReservationRepository.existsByEventIdAndUserId(eventId, user.getId())) {
+      throw new CustomException(EventErrorCode.EVENT_ALREADY_RESERVED);
+    }
+
+    EventReservation reservation = eventMapper.toReservation(event, user, request);
+
+    eventReservationRepository.save(reservation);
+
+    if (clothImageList != null && !clothImageList.isEmpty()) {
+      for (MultipartFile f : clothImageList) {
+        try {
+          String url = s3Service.uploadFileAsWebp(PathName.EVENT, f);
+
+          eventReservationImageRepository.save(
+              EventReservationImage.builder().reservation(reservation).imageUrl(url).build());
+        } catch (CustomException e) {
+          throw e;
+        } catch (Exception e) {
+          log.error("[EVENT] reserveEvent - image upload failed, eventId={}", eventId, e);
+          throw new CustomException(EventErrorCode.EVENT_RESERVATION_IMAGE_UPLOAD_FAILED);
+        }
+      }
+    }
+
+    event.increaseReservedCount();
+
+    return eventMapper.toReservationResponse(event);
+  }
+}
diff --git a/src/main/java/com/sku/refit/global/config/S3Config.java b/src/main/java/com/sku/refit/global/config/S3Config.java
index dd829a9..9ff4c50 100644
--- a/src/main/java/com/sku/refit/global/config/S3Config.java
+++ b/src/main/java/com/sku/refit/global/config/S3Config.java
@@ -45,6 +45,9 @@ public class S3Config {
   @Value("${cloud.aws.s3.path.cloth}")
   private String clothPath;
 
+  @Value("${cloud.aws.s3.path.event}")
+  private String eventPath;
+
   @PostConstruct
   public void init() {
     this.awsCredentials = new BasicAWSCredentials(accessKey, secretKey);
diff --git a/src/main/java/com/sku/refit/global/config/SecurityConfig.java b/src/main/java/com/sku/refit/global/config/SecurityConfig.java
index e17aeec..a03c6dd 100644
--- a/src/main/java/com/sku/refit/global/config/SecurityConfig.java
+++ b/src/main/java/com/sku/refit/global/config/SecurityConfig.java
@@ -125,7 +125,7 @@ private void configureAuthorization(HttpSecurity http) throws Exception {
                 .permitAll()
                 .requestMatchers("/error")
                 .permitAll()
-                .requestMatchers(RegexRequestMatcher.regexMatcher(".*/admin/.*"))
+                .requestMatchers(RegexRequestMatcher.regexMatcher(".*/admin($|/.*)"))
                 .hasRole("ADMIN")
                 .requestMatchers(RegexRequestMatcher.regexMatcher(".*/dev/.*"))
                 .hasRole("DEVELOPER")
diff --git a/src/main/java/com/sku/refit/global/s3/entity/PathName.java b/src/main/java/com/sku/refit/global/s3/entity/PathName.java
index 6f75c12..9c40689 100644
--- a/src/main/java/com/sku/refit/global/s3/entity/PathName.java
+++ b/src/main/java/com/sku/refit/global/s3/entity/PathName.java
@@ -12,4 +12,6 @@ public enum PathName {
   POST,
   @Schema(description = "옷")
   CLOTH,
+  @Schema(description = "행사")
+  EVENT
 }
diff --git a/src/main/java/com/sku/refit/global/s3/service/S3Service.java b/src/main/java/com/sku/refit/global/s3/service/S3Service.java
index 71258ac..08b02f4 100644
--- a/src/main/java/com/sku/refit/global/s3/service/S3Service.java
+++ b/src/main/java/com/sku/refit/global/s3/service/S3Service.java
@@ -39,4 +39,6 @@ String uploadFile(
   String extractKeyNameFromUrl(String imageUrl);
 
   void fileExists(String keyName);
+
+  String uploadFileAsWebp(PathName pathName, MultipartFile file);
 }
diff --git a/src/main/java/com/sku/refit/global/s3/service/S3ServiceImpl.java b/src/main/java/com/sku/refit/global/s3/service/S3ServiceImpl.java
index d9b8864..d350341 100644
--- a/src/main/java/com/sku/refit/global/s3/service/S3ServiceImpl.java
+++ b/src/main/java/com/sku/refit/global/s3/service/S3ServiceImpl.java
@@ -3,6 +3,9 @@
  */
 package com.sku.refit.global.s3.service;
 
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
 import java.io.InputStream;
 import java.util.List;
 import java.util.UUID;
@@ -16,6 +19,8 @@
 import com.amazonaws.services.s3.model.ListObjectsV2Request;
 import com.amazonaws.services.s3.model.ObjectMetadata;
 import com.amazonaws.services.s3.model.PutObjectRequest;
+import com.sksamuel.scrimage.ImmutableImage;
+import com.sksamuel.scrimage.webp.WebpWriter;
 import com.sku.refit.global.config.S3Config;
 import com.sku.refit.global.exception.CustomException;
 import com.sku.refit.global.s3.dto.S3Response;
@@ -30,6 +35,8 @@
 @RequiredArgsConstructor
 public class S3ServiceImpl implements S3Service {
 
+  private static final int WEBP_QUALITY = 90;
+
   private final AmazonS3 amazonS3;
   private final S3Config s3Config;
 
@@ -194,6 +201,80 @@ private String getPrefix(PathName pathName) {
       case PROFILE_IMAGE -> s3Config.getProfileImagePath();
       case POST -> s3Config.getPostPath();
       case CLOTH -> s3Config.getClothPath();
+      case EVENT -> s3Config.getEventPath();
     };
   }
+
+  @Override
+  public String uploadFileAsWebp(PathName pathName, MultipartFile file) {
+
+    validateFile(file);
+
+    byte[] webpBytes = convertToWebp(file);
+
+    String keyName = getPrefix(pathName) + "/" + UUID.randomUUID() + ".webp";
+
+    ObjectMetadata metadata = new ObjectMetadata();
+    metadata.setContentLength(webpBytes.length);
+    metadata.setContentType("image/webp");
+
+    try (ByteArrayInputStream inputStream = new ByteArrayInputStream(webpBytes)) {
+      amazonS3.putObject(
+          new PutObjectRequest(s3Config.getBucket(), keyName, inputStream, metadata));
+
+      log.info("파일(WebP) 업로드 성공 - bucket: {}, keyName: {}", s3Config.getBucket(), keyName);
+
+      return amazonS3.getUrl(s3Config.getBucket(), keyName).toString();
+
+    } catch (Exception e) {
+      log.error("S3 WebP 업로드 중 오류 발생 - bucket: {}, keyName: {}", s3Config.getBucket(), keyName, e);
+      throw new CustomException(S3ErrorStatus.FILE_SERVER_ERROR);
+    }
+  }
+
+  private byte[] convertToWebp(MultipartFile file) {
+
+    try {
+      ImmutableImage image;
+      try {
+        image = ImmutableImage.loader().fromStream(file.getInputStream());
+      } catch (IOException e) {
+        log.error(
+            "이미지 디코딩 오류 - originalFilename: {}, message: {}",
+            file.getOriginalFilename(),
+            e.getMessage());
+        throw new CustomException(S3ErrorStatus.FILE_SERVER_ERROR);
+      }
+
+      if (image == null) {
+        log.warn("이미지 디코딩 실패 - originalFilename: {}", file.getOriginalFilename());
+        throw new CustomException(S3ErrorStatus.FILE_SERVER_ERROR);
+      }
+
+      WebpWriter writer = WebpWriter.DEFAULT.withQ(WEBP_QUALITY);
+
+      ByteArrayOutputStream baos = new ByteArrayOutputStream();
+      try {
+        image.forWriter(writer).write(baos);
+      } catch (IOException e) {
+        log.error(
+            "WebP 변환 중 IO 오류 - originalFilename: {}, message: {}",
+            file.getOriginalFilename(),
+            e.getMessage());
+        throw new CustomException(S3ErrorStatus.FILE_SERVER_ERROR);
+      }
+
+      return baos.toByteArray();
+
+    } catch (CustomException e) {
+      throw e;
+
+    } catch (Exception e) {
+      log.error(
+          "WebP 변환 중 예기치 않은 오류 - originalFilename: {}, message: {}",
+          file.getOriginalFilename(),
+          e.getMessage());
+      throw new CustomException(S3ErrorStatus.FILE_SERVER_ERROR);
+    }
+  }
 }
diff --git a/src/main/resources b/src/main/resources
index 5471022..d23b7c2 160000
--- a/src/main/resources
+++ b/src/main/resources
@@ -1 +1 @@
-Subproject commit 547102251cecc07b04c80516470cd71d4f4a2145
+Subproject commit d23b7c2b63504e84ea800b139b7e9235d4bf045f