a method to retrieve attendee list for event from meetup api

        :param group_url: string with meetup urlname for host group
        :param event_id: integer with meetup id for event
        :return: dictionary with list of attendee details inside [json] key

        attendee_details = self._reconstruct_attendee({})

def list_event_attendees(self, group_url, event_id):

        ''' a method to retrieve attendee list for event from meetup api

        :param group_url: string with meetup urlname for host group
        :param event_id: integer with meetup id for event
        :return: dictionary with list of attendee details inside [json] key

        attendee_details = self._reconstruct_attendee({})
        '''

    # https://www.meetup.com/meetup_api/docs/:urlname/events/:event_id/rsvps/#list

        title = '%s.list_event_attendees' % self.__class__.__name__

    # validate inputs
        input_fields = {
            'group_url': group_url,
            'event_id': event_id
        }
        for key, value in input_fields.items():
            if value:
                object_title = '%s(%s=%s)' % (title, key, str(value))
                self.fields.validate(value, '.%s' % key, object_title)

    # construct request fields
        url = '%s/%s/events/%s/rsvps' % (self.endpoint, group_url, str(event_id))

    # send request
        response_details = self._get_request(url)

    # construct method output
        event_attendees = {
            'json': []
        }
        for key, value in response_details.items():
            if key != 'json':
                event_attendees[key] = value
        for attendee in response_details['json']:
            event_attendees['json'].append(self._reconstruct_attendee(attendee))

        return event_attendees