mod placeholder info

function my_bookingslink_placeholder($replace, $EM_Event, $result) {
    if ( $result == '#_BOOKINGSLINK' ) {
        $replace = '<a href="#_BOOKINGSURL">Manage bookings/event</a>';
    }
    return $replace;
}
add_filter('em_event_output_placeholder','my_bookingslink_placeholder',1,3);