conditional placeholder registration start

// condtional placeholder if bookings are enabled and bookings start date is not yet
function my_em_regstart_bookings($replacement, $condition, $match, $EM_Event) {
    if( is_object($EM_Event) && preg_match('/^awaiting_regstart$/',$condition, $matches) ) {
            if ( $this->event_rsvp && $this->ticket_start > current_time('timestamp') ) {
        $replacement = '';
      } else {
        $replacement = preg_replace("/\{\/?$condition\}/", '', $match);
            }
    }
    return $replacement;
}
add_action('em_event_output_condition', 'my_em_regstart_bookings', 1, 4);