Add a ninja form contact form to an event that has at least one sold out ticket. Useful for capturing names for a waiting list.

waiting_list.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

add_filter( 'FHEE__ticket_selector_chart_template__ticket_sold_out_msg', 'ee_ticket_sold_out_link', 11 );
function ee_ticket_sold_out_link() {
	return '<a href="#waitlist">Join Waiting List</a>';
}

add_filter( 'FHEE__ticket_selector_chart_template__ticket_sold_out_msg', 'ee_ticket_sold_out_message' );
function ee_ticket_sold_out_message() {
	add_action( 'AHEE_event_details_after_post', 'display_ee_ticket_sold_out_message' );
}

function display_ee_ticket_sold_out_message() {
	echo '<div id="waitlist">';
	echo '<p>You can sign up for the waiting list here</p>';
	if( function_exists( 'ninja_forms_display_form' ) ){ ninja_forms_display_form( 1 ); }
	echo '</div>';
}