code: public com.squareup.okhttp.Call getCharactersCharacterIdCalendarAsync(Integer characterId, String datasource,
              Integer fromEvent, String ifNoneMatch, String token,
              final ApiCallback<List<CharacterCalendarResponse>> callback) throws ApiException {
  
          com.squareup.okhttp.Call call = getCharactersCharacterIdCalendarValidateBeforeCall(characterId, datasource,
                  fromEvent, ifNoneMatch, token, callback);
          Type localVarReturnType = new TypeToken<List<CharacterCalendarResponse>>() {
          }.getType();
          apiClient.executeAsync(call, localVarReturnType, callback);
          return call;
      }
docs: List calendar event summaries (asynchronously) Get 50 event summaries
  from the calendar. If no from_event ID is given, the resource will return
  the next 50 chronological event summaries from now. If a from_event ID is
  specified, it will return the next 50 chronological event summaries from
  after that event --- This route is cached for up to 5 seconds SSO Scope:
  esi-calendar.read_calendar_events.v1
  
  @param characterId
  An EVE character ID (required)
  @param datasource
  The server name you would like data from (optional, default to
  tranquility)
  @param fromEvent
  The event ID to retrieve events from (optional)
  @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)
  @param callback
  The callback to be executed when the API call finishes
  @return The request call
  @throws ApiException
  If fail to process the API call, e.g. serializing the request
  body object