$this->_id = CRM_Utils_Request::retrieve('id', 'Positive', $this, FALSE, NULL, 'GET');
if ($this->_id) {
$this->assign('eventId', $this->_id);
$this->_id = CRM_Utils_Request::retrieve('id', 'Positive', $this, FALSE, NULL, 'GET');
if ($this->_id) {
$this->assign('eventId', $this->_id);