tribe_get_ticket_form

    /**
     * Placeholder function that is used for ticketing plugins
     * meant to be filtered by such plugins
     *
     * @author jkudish
     * @since 2.1
     * @return void
     */
    function tribe_get_ticket_form() {
        $ticket_form = apply_filters('tribe_get_ticket_form', false);
        if ($ticket_form && is_string($ticket_form)) {
            echo $ticket_form;
        } else {
            return $ticket_form;
        }
    }