docs: def _get_event(receiver_id, event_id):
          """Find event and check access rights."""
          event = Event.query.filter_by(
              receiver_id=receiver_id, id=event_id
          ).first_or_404()
  
          try:
              user_id = request.oauth.access_token.user_id
          except AttributeError:
              user_id = current_user.get_id()
  
          if event.user_id != int(user_id):
              abort(401)
  
          return event