/** Fetch data from congress_details */
 public function actionIndex()
 {
     $sql = "SELECT * FROM congress_details WHERE start_date >= curdate() ORDER BY start_date";
     $records = CongressDetails::findBySql($sql)->all();
     $return = [];
     foreach ($records as $row) {
         $protocol = stripos($_SERVER['SERVER_PROTOCOL'], 'https') === true ? 'https://' : 'http://';
         $host = $_SERVER['HTTP_HOST'];
         $row = $row->toArray();
         $row['image'] = $host . "/rest/backend/web/" . $row['image'];
         $return[] = $row;
     }
     return $return;
 }