MT | ET | Add a + Google Calendar link to each ticket in the tickets email

tribe_add_gcal_to_email.php

<?php

/**
 * Adds a + Google Calendar link to each ticket in the tickets email
 */
function tribe_add_gcal_to_email( $event ) {
	printf(
		'<a class="tribe-events-gcal tribe-events-button" href="%1$s" title="%2$s">%3$s</a>',
		Tribe__Events__Main::instance()->esc_gcal_url( tribe_get_gcal_link( $event ) ),
		esc_attr__( 'Add to Google Calendar', 'the-events-calendar' ),
		esc_html__( 'Add to Google Calendar', 'the-events-calendar' )
	);
}
add_action ( 'tribe_tickets_ticket_email_ticket_bottom', 'tribe_add_gcal_to_email', 101, 1 );