Add City and State information from registration to attendee list. From: https://eventespresso.com/topic/ee4-modify-list-attendees-shortcode-to-show-additional-attendee-info/

content-espresso_event_attendees.php

<?php
/**
 * Content Template for the [ESPRESSO_EVENT_ATTENDEES] shortcode
 *
 * @package Event Espresso
 * @subpackage templates
 * @since 4.6.29
 * @author Darren Ethier
 *
 * Template Args that are available in this template
 * @type EE_Attendee $contact
 * @type bool       $show_gravatar  whether to show gravatar or not.
 */
if ( $show_gravatar ) {
	$gravatar = get_avatar( $contact->email(),
		(int) apply_filters( 'FHEE__loop-espresso_attendees-shortcode__template__avatar_size', 32 )
		);
} else {
	$gravatar = '';
}

$states = EEM_State::instance()->get_all_states();
$state = isset( $states[ $contact->state_ID() ] ) ? $states[ $contact->state_ID() ]->get( 'STA_name' ) : $contact->state_ID();
$state = ! is_numeric( $state ) ? ', ' . $state : '';

$countries = EEM_Country::instance()->get_all_countries();
$country = isset( $countries[ $contact->country_ID() ] ) ? $countries[ $contact->country_ID() ]->get( 'CNT_name' ) : $contact->country_ID();
$country = ! empty( $country ) ? ', ' . $country : '';


?>
<?php do_action( 'AHEE__content-espresso_event_attendees__before', $contact, $show_gravatar ); ?>
<li><?php echo $gravatar . '&nbsp;' .  $contact->full_name() 
. ' &mdash; ' 
. $contact->city()
. $state 
. $country; ?></li>

<?php do_action( 'AHEE__content-espresso_event_attendees__after', $contact, $show_gravatar ); ?>