Prefix a string with "MyOhMy_" to easily identify that this function is happening on the passed text.

functions.php

<?php
/**
 * Prefix a string with "MyOhMy_" to easily identify that this function is happening on the passed text.
 *
 * Requires Event Tickets v4.10.9 (October 2019) or later. Functions are found in
 * /wp-content/plugins/event-tickets/src/template-tags/tickets.php
 *
 * @link https://gist.github.com/cliffordp/9d878488e5def7419c8bb906f8929d15 This snippet.
 * @link https://central.tri.be/issues/128298 Used to QA this ticket.
 * @link https://cl.ly/403a9c5fe5e7 Screenshot of this snippet working on Attendees Report.
 * @link https://cl.ly/8ad94792e421 Screenshot of this snippet working on TEC Event edit screen.
 * @link https://cl.ly/1ccd13c19e21 Screenshot of this snippet working on TEC Event front end.
 *
 * @param $text
 *
 * @return string
 */
function my_oh_my_128298( $text ) {
	return 'MyOhMy_' . $text;
}

add_filter( 'tribe_get_rsvp_label_singular', 'my_oh_my_128298' );
add_filter( 'tribe_get_rsvp_label_singular_lowercase', 'my_oh_my_128298' );
add_filter( 'tribe_get_rsvp_label_plural', 'my_oh_my_128298' );
add_filter( 'tribe_get_rsvp_label_plural_lowercase', 'my_oh_my_128298' );
add_filter( 'tribe_get_ticket_label_singular', 'my_oh_my_128298' );
add_filter( 'tribe_get_ticket_label_singular_lowercase', 'my_oh_my_128298' );
add_filter( 'tribe_get_ticket_label_plural', 'my_oh_my_128298' );
add_filter( 'tribe_get_ticket_label_plural_lowercase', 'my_oh_my_128298' );