code: def get_event_timelines(self, event_ids, session=None, lightweight=None):
          
          url = '%s%s' % (self.url, 'eventTimelines')
          params = {
              'eventIds': ','.join(str(x) for x in event_ids),
              'alt': 'json',
              'regionCode': 'UK',
              'locale': 'en_GB'
          }
          (response, elapsed_time) = self.request(params=params, session=session, url=url)
          return self.process_response(response, resources.EventTimeline, elapsed_time, lightweight)
docs: Returns a list of event timelines based on event id's
          supplied.
  
          :param list event_ids: List of event id's to return
          :param requests.session session: Requests session object
          :param bool lightweight: If True will return dict not a resource
  
          :rtype: list[resources.EventTimeline]