EE4 filter event title with meta field

//this can go in the themes functions.php
// or into a site specific/custom functions plugin.

function modified_ee_title($title, $sep) {
	global $post;
	$postype = get_post_type( $post );
	//if not an EE event, return
	if($postype != "espresso_events" || !in_the_loop() ) { return $title; }

	//get the custom/meta fields
	$meta = get_post_custom($post->id);

	//if the meta field called abc doesnt exist, return
	//obviously change abc to the actual meta key...
	if( !isset($meta['abc']) ) { return $title; }

	//modify the title
	$title = $title . ' ' . $meta['abc'][0];

	//return the modified title
	return $title;

}
add_filter( 'the_title', 'modified_ee_title', 10, 2 );