function json($slug, Request $request, Application $app)
 {
     if (!$this->build($slug, $request, $app)) {
         $app->abort(404, "Event does not exist.");
     }
     $eventMedias = array();
     $ourRequest = new \Request($request);
     if ($ourRequest->getGetOrPostBoolean("includeMedias", false)) {
         $mrb = new MediaRepositoryBuilder();
         $mrb->setEvent($this->parameters['event']);
         $mrb->setIncludeDeleted(false);
         $eventMedias = $mrb->fetchAll();
     }
     $json = new EventListJSONBuilder($app['currentSite'], $app['currentTimeZone']);
     $json->addEvent($this->parameters['event'], $this->parameters['groups'], $this->parameters['venue'], $this->parameters['area'], $this->parameters['country'], $eventMedias);
     return $json->getResponse();
 }