Displays a simple list of those who've placed a booking for an event

bookees-list.php

/**
 * Appends a list of bookees to the event description.
 * If you are selling tickets by 'date', it shows the bookees for each date.
 */
function my_display_attendees( $content ){
	
	if( 'event' != get_post_type() || !is_singular( 'event' ) ){
		return $content;
	}
	
	$occurrences = eo_get_the_occurrences_of( get_the_ID() );
	
	if( !$occurrences ){
		return $content;
	}	
	
	$content .= '<h4>Attendees</h4>';
	
	if( eventorganiser_pro_get_option( 'book_series' ) ){
		//Booking by series, display all bookings
		$bookings = eo_get_bookings( array(
			'status'        =>'confirmed',
			'event_id'      => get_the_ID(),
		) );
		
		if( !$bookings ){
			continue;
		}
		
		$content .= '<ul>';
		foreach( $bookings as $booking ){
			$content .= sprintf( '<li> %1$s</li>', eo_get_booking_meta( $booking->ID, 'bookee_display_name' ) );
		}
		$content .= '</ul>';
		
	}else{
		//Booking by date, display all bookings for each date
		foreach( $occurrences as $occurrence_id => $occurrence ){
		
			$bookings = eo_get_bookings( array(
				'status'        =>'confirmed',
				'event_id'      => get_the_ID(),
				'occurrence_id' => $occurrence_id,
			) );
		
			if( !$bookings ){
				continue;
			}

			if( eo_reoccurs() ){
				$content .= sprintf( '<h5>%s</h5>', $occurrence['start']->format( get_option( 'date_format' ) ) );
			}
		
			$content .= '<ul>';
			foreach( $bookings as $booking ){
				$content .= sprintf( '<li> %1$s</li>', eo_get_booking_meta( $booking->ID, 'bookee_display_name' ) );
			}
			$content .= '</ul>';
			
		}
	}
	
	return $content;
		
}
add_action( 'the_content', 'my_display_attendees' );