Open /event/ links in new window

snippet-example.php

<?php
add_action( 'wp_footer', function() {
// Evaluate conditional here
// Maybe an is_page conditional? https://developer.wordpress.org/reference/functions/is_page/
if ( true === true ) :
?>
	
<script>
	(function () {
	 	// CUSTOMIZE DOMAIN NAME HERE
		const DOMAIN_NAME = 'www.example.com';

	 	// Grab all links that start with /event/
		const eventLinks = document.querySelectorAll( `a[href^="https://${DOMAIN_NAME}/event/"]` );
		
		// Apply the target="_blank" attribute/value to each link
		eventLinks.forEach( link => link.setAttribute( 'target', '_blank' ) );
	} )();
</script>

<?php
endif;
} );