Add more prefetching for LessonEvent

aleksis/apps/chronos/models.py

@@ -1533,7 +1533,7 @@ class LessonEvent(CalendarEvent):
             .get_objects(request, params)
             .not_instance_of(SupervisionEvent)
             .select_related("subject", "course")
-            .prefetch_related("groups", "teachers", "rooms")
+            .prefetch_related("groups", "teachers", "rooms", "groups__members")
         )
 
         if request and not has_person(request.user):