docs: public com.squareup.okhttp.Call getCharactersCharacterIdCalendarEventIdAsync(Integer characterId, Integer eventId,
              String datasource, String ifNoneMatch, String token,
              final ApiCallback<CharacterCalendarEventResponse> callback) throws ApiException {
  
          com.squareup.okhttp.Call call = getCharactersCharacterIdCalendarEventIdValidateBeforeCall(characterId, eventId,
                  datasource, ifNoneMatch, token, callback);
          Type localVarReturnType = new TypeToken<CharacterCalendarEventResponse>() {
          }.getType();
          apiClient.executeAsync(call, localVarReturnType, callback);
          return call;
      }