code: def all_comments(self):
          
          ctype = ContentType.objects.get(app_label__exact="happenings", model__exact='event')
          update_ctype = ContentType.objects.get(app_label__exact="happenings", model__exact='update')
          update_ids = self.update_set.values_list('id', flat=True)
  
          return Comment.objects.filter(
              Q(content_type=ctype.id, object_pk=self.id) |
              Q(content_type=update_ctype.id, object_pk__in=update_ids)
          )
docs: Returns combined list of event and update comments.