diff --git a/internal/calendar/calendar.go b/internal/calendar/calendar.go
index 6771e3f..017fecb 100644
--- a/internal/calendar/calendar.go
+++ b/internal/calendar/calendar.go
@@ -80,7 +80,18 @@ func (cal Calendar) GetEventsOn(date time.Time) ([]ical.Event, error) {
 		start2, _ := events[j].DateTimeStart(cal.tz)
 		return start1.Before(start2)
 	})
-	return events, nil
+
+	// check for doubles via uid
+	uids := make(map[string]struct{})
+	dedupedEvents := make([]ical.Event, 0)
+	for _, e := range events {
+		uid := e.Props.Get(ical.PropUID).Value
+		if _, ok := uids[uid]; !ok {
+			dedupedEvents = append(dedupedEvents, e)
+			uids[uid] = struct{}{}
+		}
+	}
+	return dedupedEvents, nil
 }
 
 func GetDateWithoutTime(date time.Time) time.Time {
diff --git a/internal/calendar/calendar_test.go b/internal/calendar/calendar_test.go
index a2bd3b1..7a73cdd 100644
--- a/internal/calendar/calendar_test.go
+++ b/internal/calendar/calendar_test.go
@@ -14,15 +14,22 @@ const (
 	xHainDump_1 = "testData.txt"
 )
 
-func NewWantedCalendarEventWithUIDSet(uid string) ical.Event {
+func NewWantedCalendarEventWithUIDAndSummary(uid string, summary string) ical.Event {
 	return ical.Event{
 		Component: &ical.Component{
 			Name: ical.CompEvent,
 			Props: ical.Props{
+				ical.PropSummary: []ical.Prop{
+					{
+						Name:   ical.PropSummary,
+						Params: make(ical.Params),
+						Value:  summary,
+					},
+				},
 				ical.PropUID: []ical.Prop{
 					{
 						Name:   ical.PropUID,
-						Params: make(ical.Params, 0),
+						Params: make(ical.Params),
 						Value:  uid,
 					},
 				},
@@ -51,45 +58,67 @@ func TestCalendar_GetEventsOn(t *testing.T) {
 			name:         "LED Workshop recurring",
 			testDataFile: getCalendarDataFromFile(xHainDump_1),
 			args: args{
-				date: time.Date(2023, 02, 23, 0, 0, 0, 0, time.Local),
+				date: time.Date(2023, 2, 23, 0, 0, 0, 0, time.Local),
+			},
+			wantErr: false,
+			want: []ical.Event{
+				NewWantedCalendarEventWithUIDAndSummary("dae1e4eb-7213-4620-bc9f-1bdb8a023af9", "Workshop - Learn PCB design with KiCad"),
+			},
+		},
+		{
+			name:         "LED Workshop recurring exception",
+			testDataFile: getCalendarDataFromFile(xHainDump_1),
+			args: args{
+				date: time.Date(2023, 3, 2, 0, 0, 0, 0, time.Local),
+			},
+			wantErr: false,
+			want: []ical.Event{
+				NewWantedCalendarEventWithUIDAndSummary("66adcfc4-6827-45a2-a5b4-655923d5dd62", "How to use the latest AIs in your daily workflow - for... everything?"),
+			},
+		},
+		{
+			name:         "Gespräch unter Bäumen instances",
+			testDataFile: getCalendarDataFromFile(xHainDump_1),
+			args: args{
+				date: time.Date(2023, 3, 21, 0, 0, 0, 0, time.Local),
 			},
 			wantErr: false,
 			want: []ical.Event{
-				NewWantedCalendarEventWithUIDSet("dae1e4eb-7213-4620-bc9f-1bdb8a023af9"),
+				NewWantedCalendarEventWithUIDAndSummary("5fb7f276-54d6-4c30-a993-92cfe962e41b", "Gespräch unter Bäumen (mit Elisa Filevich)"),
 			},
 		},
 		{
 			name:         "Drones' night",
 			testDataFile: getCalendarDataFromFile(xHainDump_1),
 			args: args{
-				date: time.Date(2023, 02, 24, 0, 0, 0, 0, time.Local),
+				date: time.Date(2023, 2, 24, 0, 0, 0, 0, time.Local),
 			},
 			wantErr: false,
 			want: []ical.Event{
-				NewWantedCalendarEventWithUIDSet("1ec26b84-60e1-437d-a455-db6404dff879"),
+				NewWantedCalendarEventWithUIDAndSummary("1ec26b84-60e1-437d-a455-db6404dff879", "Drones' night"),
 			},
 		},
 		{
 			name:         "offener Montag",
 			testDataFile: getCalendarDataFromFile(xHainDump_1),
 			args: args{
-				date: time.Date(2023, 02, 27, 0, 0, 0, 0, time.Local),
+				date: time.Date(2023, 2, 27, 0, 0, 0, 0, time.Local),
 			},
 			wantErr: false,
 			want: []ical.Event{
-				NewWantedCalendarEventWithUIDSet("c9158eec-083a-4798-9860-99c4a83cce0f"),
+				NewWantedCalendarEventWithUIDAndSummary("c9158eec-083a-4798-9860-99c4a83cce0f", "offener Montag"),
 			},
 		},
 		{
 			name:         "Multiple events: XMPP/Wednesday Meeting",
 			testDataFile: getCalendarDataFromFile(xHainDump_1),
 			args: args{
-				date: time.Date(2023, 02, 8, 0, 0, 0, 0, time.Local),
+				date: time.Date(2023, 2, 8, 0, 0, 0, 0, time.Local),
 			},
 			wantErr: false,
 			want: []ical.Event{
-				NewWantedCalendarEventWithUIDSet("3591c731-0e27-4902-9ae0-8748d46841f3"),
-				NewWantedCalendarEventWithUIDSet("1695d4c9-aa37-4b52-bda9-2132ac92e3a2"),
+				NewWantedCalendarEventWithUIDAndSummary("3591c731-0e27-4902-9ae0-8748d46841f3", "XMPP-Meetup"),
+				NewWantedCalendarEventWithUIDAndSummary("1695d4c9-aa37-4b52-bda9-2132ac92e3a2", "xHain Wednesday meeting"),
 			},
 		},
 		{
@@ -100,8 +129,8 @@ func TestCalendar_GetEventsOn(t *testing.T) {
 			},
 			wantErr: false,
 			want: []ical.Event{
-				NewWantedCalendarEventWithUIDSet("290b69b7-aaaf-47d4-88d1-d42366e36163"),
-				NewWantedCalendarEventWithUIDSet("77b564a3-4e8c-4e3b-b9db-990e622d04ff"),
+				NewWantedCalendarEventWithUIDAndSummary("290b69b7-aaaf-47d4-88d1-d42366e36163", "Kindernachmittag"),
+				NewWantedCalendarEventWithUIDAndSummary("77b564a3-4e8c-4e3b-b9db-990e622d04ff", "xHain @ Camp23 Brainstorming"),
 			},
 		},
 	}
@@ -117,7 +146,7 @@ func TestCalendar_GetEventsOn(t *testing.T) {
 			cal := Calendar{
 				url:      "file",
 				tz:       time.Local,
-				Logger:   log.New(os.Stdout, "[TEST]", log.Ldate|log.Ltime|log.Lmsgprefix|log.Lshortfile),
+				Logger:   log.New(os.Stdout, "[TEST] ", log.Ldate|log.Ltime|log.Lmsgprefix|log.Lshortfile),
 				Calendar: calendar,
 			}
 			got, err := cal.GetEventsOn(tt.args.date)
diff --git a/internal/calendar/testData.txt b/internal/calendar/testData.txt
index a9e8be1..dbc0e9d 100644
--- a/internal/calendar/testData.txt
+++ b/internal/calendar/testData.txt
@@ -1016,6 +1016,21 @@ STATUS:CONFIRMED
 SUMMARY:Online: Jugendhackt Internationaler Frauentag / Community Talk
 END:VEVENT
 BEGIN:VEVENT
+CREATED:20230224T152336Z
+DTSTAMP:20230227T115419Z
+LAST-MODIFIED:20230227T115419Z
+SEQUENCE:3
+UID:4cf5a2ae-420f-4cba-93d2-434faf0de11a
+DTSTART;TZID=Europe/Berlin:20230311T110000
+DTEND;TZID=Europe/Berlin:20230311T190000
+STATUS:CONFIRMED
+SUMMARY:infrastructure and dinner
+DESCRIPTION:Let's meet once a month to work on infrastructure things\, may 
+ it be sorting screws\, cleaning the space or building cool things. It's a 
+ nice way to also get to know each other and have a nice lunch/dinner toget
+ her afterwards.
+END:VEVENT
+BEGIN:VEVENT
 CREATED:20210920T095652Z
 DTSTAMP:20211128T172320Z
 LAST-MODIFIED:20211128T172320Z
@@ -1263,6 +1278,20 @@ RRULE:FREQ=DAILY;INTERVAL=14;UNTIL=20220604T115959Z
 EXDATE;TZID=Europe/Berlin:20220521T140000
 END:VEVENT
 BEGIN:VEVENT
+CREATED:20230305T144015Z
+DTSTAMP:20230305T144107Z
+LAST-MODIFIED:20230305T144107Z
+SEQUENCE:2
+UID:7edc3d9d-3445-4e17-b8d8-1abe1ede9635
+DTSTART;TZID=Europe/Berlin:20230309T180000
+DTEND;TZID=Europe/Berlin:20230309T200000
+STATUS:CONFIRMED
+SUMMARY:Fusion360/CNC work shop
+DESCRIPTION:We will probably focus on how to import and scale 2d file types
+  (dxf and jpg) and some tips  to work around the issues with some DXF file
+ s.
+END:VEVENT
+BEGIN:VEVENT
 CREATED:20220210T155604Z
 DTSTAMP:20220210T155619Z
 LAST-MODIFIED:20220210T155619Z
@@ -1330,6 +1359,17 @@ DTEND;TZID=Europe/Berlin:20221007T230000
 STATUS:CONFIRMED
 END:VEVENT
 BEGIN:VEVENT
+CREATED:20230311T224036Z
+DTSTAMP:20230311T224049Z
+LAST-MODIFIED:20230311T224049Z
+SEQUENCE:2
+UID:2448da04-5d7f-4518-870f-f786e6c93c7a
+DTSTART;TZID=Europe/Berlin:20230415T110000
+DTEND;TZID=Europe/Berlin:20230415T190000
+STATUS:CONFIRMED
+SUMMARY:Infrastructure and Dinner
+END:VEVENT
+BEGIN:VEVENT
 CREATED:20221019T114653Z
 DTSTAMP:20221019T114902Z
 LAST-MODIFIED:20221019T114902Z
@@ -1364,6 +1404,47 @@ DTEND;TZID=Europe/Berlin:20221002T170000
 STATUS:CONFIRMED
 END:VEVENT
 BEGIN:VEVENT
+CREATED:20230209T105507Z
+DTSTAMP:20230314T151728Z
+LAST-MODIFIED:20230314T151728Z
+SEQUENCE:2
+UID:892e3abe-3eca-40a6-9b87-4be7da3b10bd
+DTSTART;TZID=Europe/Berlin:20230309T183000
+DTEND;TZID=Europe/Berlin:20230309T203000
+STATUS:CONFIRMED
+SUMMARY:Beginners workshop - How to plan & build your own LED project
+LOCATION:xHain
+DESCRIPTION:Learn how to plan and build a simple LED project\, while learni
+ ng the basics of LEDs\, soldering and how to build an awesome looking LED 
+ project. No experience needed.\n\nMore details and other LED related event
+ s: https://events.glowingkitty.com
+RRULE:FREQ=WEEKLY;INTERVAL=2;BYDAY=TH
+RELATED-TO;RELTYPE=SIBLING:a50acfcb-b86f-4aa4-8613-a1a7ccc23892
+EXDATE;TZID=Europe/Berlin:20230309T183000
+EXDATE;TZID=Europe/Berlin:20230406T183000
+END:VEVENT
+BEGIN:VEVENT
+CREATED:20230303T102215Z
+DTSTAMP:20230303T102215Z
+LAST-MODIFIED:20230303T102215Z
+SEQUENCE:1
+UID:892e3abe-3eca-40a6-9b87-4be7da3b10bd
+DTSTART;TZID=Europe/Berlin:20230323T183000
+DTEND;TZID=Europe/Berlin:20230323T203000
+STATUS:CONFIRMED
+SUMMARY:Workshop - Learn PCB design with KiCad
+LOCATION:xHain
+DESCRIPTION:A beginner friendly introduction to learn PCB design with KiCad
+ . It's not as complicated as you think!:) Basic electronics knowledge reco
+ mmended. \n\nWhat you should bring with you:\nPlease being your laptop. Wi
+ th Windows\, macOS\, or Linux.\nAnd prepare for the workshop by downloadin
+ g this repo and follow the "Workshop preparation" part of the README:\nhtt
+ p://pcb-workshop.glowingkitty.com/\n\nMore details & other LED related eve
+ nts: https://events.glowingkitty.com
+RELATED-TO;RELTYPE=SIBLING:a50acfcb-b86f-4aa4-8613-a1a7ccc23892
+RECURRENCE-ID;TZID=Europe/Berlin:20230323T183000
+END:VEVENT
+BEGIN:VEVENT
 CREATED:20220210T154859Z
 DTSTAMP:20220510T085054Z
 LAST-MODIFIED:20220510T085054Z
@@ -1477,6 +1558,20 @@ STATUS:CONFIRMED
 SUMMARY:CoderDojo: Lötworkshop
 END:VEVENT
 BEGIN:VEVENT
+CREATED:20230317T095716Z
+DTSTAMP:20230317T095955Z
+LAST-MODIFIED:20230317T095955Z
+SEQUENCE:2
+UID:5baeeb24-e843-4143-bab8-13ceb8ad0c96
+DTSTART;TZID=Europe/Berlin:20230326T150000
+DTEND;TZID=Europe/Berlin:20230326T180000
+STATUS:CONFIRMED
+SUMMARY:Hackaday Tour
+DESCRIPTION:On March 25th Hackaday Berlin celebrates makers and hackers at 
+ MotionLab. After a Brunch and badge hacking session on Sunday everyone is 
+ invited by Dave to a tour to see our hackspace
+END:VEVENT
+BEGIN:VEVENT
 CREATED:20230103T120550Z
 DTSTAMP:20230109T071116Z
 LAST-MODIFIED:20230109T071116Z
@@ -1495,6 +1590,17 @@ DESCRIPTION:Am Sonntag dem 22.1. öffnet der xHain extra für Kinder. Du ka
  . Diese sind hier zu finden https://www.berlin.de/sen/bjf/corona/schule.
 END:VEVENT
 BEGIN:VEVENT
+CREATED:20230317T223320Z
+DTSTAMP:20230317T223327Z
+LAST-MODIFIED:20230317T223327Z
+SEQUENCE:2
+UID:f2f00a51-ee5c-476c-989f-f1cb227f45fb
+DTSTART;TZID=Europe/Berlin:20230422T110000
+DTEND;TZID=Europe/Berlin:20230422T140000
+STATUS:CONFIRMED
+SUMMARY:coderdojo soldering workshop
+END:VEVENT
+BEGIN:VEVENT
 CREATED:20221118T143132Z
 DTSTAMP:20221118T143414Z
 LAST-MODIFIED:20221118T143414Z
@@ -1636,6 +1742,14 @@ RELATED-TO;RELTYPE=SIBLING:bcc1ce94-d111-4cd6-9083-6a1901755f71
 RECURRENCE-ID;TZID=Europe/Berlin:20230302T183000
 END:VEVENT
 BEGIN:VEVENT
+DTSTAMP:20230309T091817Z
+UID:45893fe8-b6f7-4841-8fb3-78a6a1bbf8ff
+SUMMARY:xHain binge watching night
+DTSTART;TZID=Europe/Berlin:20230319T180000
+DTEND;TZID=Europe/Berlin:20230319T235900
+STATUS:CONFIRMED
+END:VEVENT
+BEGIN:VEVENT
 CREATED:20221119T180415Z
 DTSTAMP:20221119T182255Z
 LAST-MODIFIED:20221119T182255Z
@@ -1820,6 +1934,17 @@ DESCRIPTION:Learn how to 3D model your LED project in Fusion360. For better
 RECURRENCE-ID;TZID=Europe/Berlin:20230112T183000
 END:VEVENT
 BEGIN:VEVENT
+CREATED:20230320T121638Z
+DTSTAMP:20230320T121725Z
+LAST-MODIFIED:20230320T121725Z
+SEQUENCE:2
+UID:c0dd944a-5319-40eb-9da3-e1428874c0f8
+DTSTART;TZID=Europe/Berlin:20230325T133700
+DTEND;TZID=Europe/Berlin:20230325T235900
+STATUS:CONFIRMED
+SUMMARY:open hackspace day
+END:VEVENT
+BEGIN:VEVENT
 DTSTAMP:20230121T083814Z
 UID:d2186fb2-a58f-420e-8d11-84b0efd55ee9
 SUMMARY:Critical making workshop
@@ -1841,7 +1966,7 @@ SUMMARY:JungHacker:innen Tag
 DESCRIPTION:https://coderdojo.red/posts/junghackerinnentag//
 END:VEVENT
 BEGIN:VEVENT
-DTSTAMP:20230131T204914Z
+DTSTAMP:20230308T105105Z
 UID:3591c731-0e27-4902-9ae0-8748d46841f3
 SUMMARY:XMPP-Meetup
 DTSTART;TZID=Europe/Berlin:20230208T180000
@@ -1850,26 +1975,9 @@ RRULE:FREQ=MONTHLY;BYDAY=2WE
 STATUS:CONFIRMED
 RELATED-TO;RELTYPE=SIBLING:95b1aba9-c5fe-417d-8ddc-f425ff09a119
 CREATED:20230131T204914Z
-LAST-MODIFIED:20230131T204914Z
-SEQUENCE:0
-END:VEVENT
-BEGIN:VEVENT
-CREATED:20230209T105507Z
-DTSTAMP:20230209T105507Z
-LAST-MODIFIED:20230209T105507Z
-SEQUENCE:0
-UID:892e3abe-3eca-40a6-9b87-4be7da3b10bd
-DTSTART;TZID=Europe/Berlin:20230309T183000
-DTEND;TZID=Europe/Berlin:20230309T203000
-STATUS:CONFIRMED
-SUMMARY:Beginners workshop - How to plan & build your own LED project
-LOCATION:xHain
-DESCRIPTION:Learn how to plan and build a simple LED project\, while learni
- ng the basics of LEDs\, soldering and how to build an awesome looking LED 
- project. No experience needed.\n\nMore details and other LED related event
- s: https://events.glowingkitty.com
-RRULE:FREQ=WEEKLY;INTERVAL=2;BYDAY=TH
-RELATED-TO;RELTYPE=SIBLING:a50acfcb-b86f-4aa4-8613-a1a7ccc23892
+LAST-MODIFIED:20230308T105105Z
+SEQUENCE:1
+EXDATE;TZID=Europe/Berlin:20230308T180000
 END:VEVENT
 BEGIN:VEVENT
 CREATED:20230216T092448Z
@@ -2240,15 +2348,4 @@ DTSTART;TZID=Europe/Berlin:20221008T110000
 DTEND;TZID=Europe/Berlin:20221008T140000
 STATUS:CONFIRMED
 END:VEVENT
-BEGIN:VEVENT
-CREATED:20230224T152336Z
-DTSTAMP:20230224T152402Z
-LAST-MODIFIED:20230224T152402Z
-SEQUENCE:2
-UID:4cf5a2ae-420f-4cba-93d2-434faf0de11a
-DTSTART;TZID=Europe/Berlin:20230311T110000
-DTEND;TZID=Europe/Berlin:20230311T190000
-STATUS:CONFIRMED
-SUMMARY:infrastructure and dinner
-END:VEVENT
 END:VCALENDAR