/**
  * @return Instrutores
  */
 static function getInstance()
 {
     return parent::getInstance();
 }
 /**
  * @param null $orderBy
  * @return Evento[]
  */
 public function getAll($orderBy = null)
 {
     if (self::$eventos == null) {
         self::$eventos = parent::getAll($orderBy);
     }
     self::$eventos = self::ordenar(self::$eventos);
     return self::$eventos;
 }