code: public void putCharactersCharacterIdCalendarEventId(Integer characterId, Integer eventId, String datasource,
              String token, CharacterCalendarEvent characterCalendarEvent) throws ApiException {
          putCharactersCharacterIdCalendarEventIdWithHttpInfo(characterId, eventId, datasource, token,
                  characterCalendarEvent);
      }
docs: Respond to an event Set your response status to an event --- SSO Scope:
  esi-calendar.respond_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 token
  Access token to use if unable to set a header (optional)
  @param characterCalendarEvent
  (optional)
  @throws ApiException
  If fail to call the API, e.g. server error or cannot
  deserialize the response body