diff --git a/src/pretix/static/pretixpresale/widget/src/components/EventCalendarCell.vue b/src/pretix/static/pretixpresale/widget/src/components/EventCalendarCell.vue
index 76bc4db1e1..0858728c49 100644
--- a/src/pretix/static/pretixpresale/widget/src/components/EventCalendarCell.vue
+++ b/src/pretix/static/pretixpresale/widget/src/components/EventCalendarCell.vue
@@ -115,6 +115,7 @@ td(
 	.pretix-widget-event-calendar-day(v-if="day", :aria-label="dateStr") {{ daynum }}
 	.pretix-widget-event-calendar-events(v-if="day")
 		EventCalendarEvent(v-for="e in day.events", :key="e.event_url", :event="e")
+		EventCalendarEvent(v-for="e in day.events", :key="e.event_url+'-'+(e.subevent||'')", :event="e")
 </template>
 <style lang="sass">
 </style>