public function addCallback() {


            return "Congrats! Your demo callback is fully functional. Now make it do something fancy";
            $tce = self::instance();
//          return '^en/' . $tce->eventsRewriteSlug . '/' . $tce->communityRewriteSlug . '/' . $tce->rewriteSlugs['add'] . '$';
//          $tce->isEditPage = true;

//          $tce->removeFilters();
//          echo $tce->doEventForm();

        }