Return lesson events for participant

aleksis/apps/chronos/models.py

@@ -1555,6 +1555,8 @@ class LessonEvent(CalendarEvent):
             if type_ and obj_id:
                 if type_ == "TEACHER":
                     return objs.for_teacher(obj_id)
+                elif type_ == "PARTICIPANT":
+                    return objs.for_participant(obj_id)
                 elif type_ == "GROUP":
                     return objs.for_group(obj_id)
                 elif type_ == "ROOM":