00-get-event-name.php

<?php

/**
 * Retrieves the title of the Event, a custom post type.
 *
 * @param  int    $eventId the ID of the event post type
 * @return string          the title of the post.
 */
public function getName(int $eventId): string
{
  return get_the_title($eventId);
}

01-get-the-event-location-helper.php

<?php 
/**
 * A helper function for easily retrieving post meta data for a given Event.
 *
 * @param int    $id  the ID of the event
 * @param string $key the key for the post meta data for which we're retrieveing the data
 *
 * @return string the result of retrieiving the meta data
 */
private function get(int $id, string $key): string
{
	return get_post_meta($id, $key, true);
}

02-get-the-event-location.php

<?php
/**
 * @param  int    $eventID the ID of the event
 * @return string          the name of the event of an empty string
 */
public function getLocationName($eventId): string
{
	return $this->get($eventId, 'ymc-event-location-name');
}

03-get-single-post-url.php

<?php

/**
 * @return string the URL to the event next to the current event.
 */
public function getNextEventUrl()
{
	global $wpdb;
	$results = $wpdb->get_results(
		$wpdb->prepare(
			"
			SELECT *
			FROM $wpdb->posts
			WHERE ID > (
				SELECT ID
				FROM $wpdb->posts
				WHERE ID = %d
				AND post_type = '%s'
				AND post_status = '%s'
				ORDER BY ID ASC
			)
			AND post_type = '%s'
			AND post_status = '%s'
			ORDER BY ID ASC
			LIMIT 1
		",
			get_the_ID(),
			'ymc-events',
			'publish',
			'ymc-events',
			'publish'
		)
	);
  
  $result = (isset($result[0])) ? $result[0] : '';
  
  return $result;
}