code: def get_event_attendees(self, event_id, status=None, changed_since=None):
          
          data = {}
          if status:  # TODO - check the types of valid status
              data['status'] = status
          if changed_since:
              data['changed_since'] = changed_since
          return self.get("/events/{0}/attendees/".format(event_id), data=data)
docs: Returns a paginated response with a key of attendees, containing a
          list of attendee.
  
          GET /events/:id/attendees/