q7 --> add rel="nofollow" to a single event's "EVENT WEBSITE" -> "URL:" link

single-event-website-link-rel-nofollow.php

<?php
add_filter( 'tribe_get_event_website_link', 'beatrice_event_website_rel_nofollow', 10, 2);

function beatrice_event_website_rel_nofollow( $html ) {
	// bail if not an HTML link element
	if ( false === strripos( $html, '<a ' ) ) {
		return $html;
	}
	
	// bail if already has 'rel=' in HTML link element
	if ( false !== strripos( $html, 'rel=' ) ) {
		return $html;
	}
	
	// only add rel="nofollow" if we made it this far
	$html = str_ireplace( '<a ', '<a rel="nofollow" ', $html );
	
	return $html;
}