code: public List<CharacterCalendarAttendeesResponse> getCharactersCharacterIdCalendarEventIdAttendees(
              Integer characterId, Integer eventId, String datasource, String ifNoneMatch, String token)
              throws ApiException {
          ApiResponse<List<CharacterCalendarAttendeesResponse>> resp = getCharactersCharacterIdCalendarEventIdAttendeesWithHttpInfo(
                  characterId, eventId, datasource, ifNoneMatch, token);
          return resp.getData();
      }
docs: Get attendees Get all invited attendees for a given event --- This route
  is cached for up to 600 seconds SSO Scope:
  esi-calendar.read_calendar_events.v1
  
  @param characterId
  An EVE character ID (required)
  @param eventId
  The id of the event requested (required)
  @param datasource
  The server name you would like data from (optional, default to
  tranquility)
  @param ifNoneMatch
  ETag from a previous request. A 304 will be returned if this
  matches the current ETag (optional)
  @param token
  Access token to use if unable to set a header (optional)
  @return List&lt;CharacterCalendarAttendeesResponse&gt;
  @throws ApiException
  If fail to call the API, e.g. server error or cannot
  deserialize the response body