theeventscalendargravityforms

add_action('save_post', 'save_tec_event_meta_from_gravity', 11, 2);
  function save_tec_event_meta_from_gravity($postId, $post) {
    if( class_exists('TribeEvents') ) {
      // only continue if it's an event post
      if ( $post->post_type != TribeEvents::POSTTYPE || defined('DOING_AJAX') ) {
        return;
      }
      // don't do anything on autosave or auto-draft either or massupdates
      if ( wp_is_post_autosave( $postId ) || $post->post_status == 'auto-draft' || isset($_GET['bulk_edit']) || $_REQUEST['action'] == 'inline-save' ) {
        return;
      }

      if( class_exists('TribeEventsAPI') ) {
        $_POST['Organizer'] = stripslashes_deep($_POST['organizer']);
        $_POST['Venue'] = stripslashes_deep($_POST['venue']);

        if( !empty($_POST['Venue']['VenueID']) )
          $_POST['Venue'] = array(‘VenueID’ => $_POST['Venue']['VenueID']);

       if( !empty($_POST['Organizer']['OrganizerID']) )
         $_POST['Organizer'] = array(‘OrganizerID’ => $_POST['Organizer']['OrganizerID']);

        TribeEventsAPI::saveEventMeta($postId, $_POST, $post);
      }
    }
  }