source/php/Event.php
public function getEventByOriginalId($id)
    {
        $args = array(
            'meta_query' => array(
                array(
                    'key' => '_event_manager_id',
                    'value' => $id,
                ),
            ),
            'post_type' => $this->post_type,
            'posts_per_page' => '1',
        );

        $events = get_posts($args);

        if (is_wp_error($events) || !isset($events[0]->ID)) {
            return false;
        }

        return $events[0]->ID;
    }
public function getEventByOriginalId($id)
    {
        $args = array(
            'meta_query' => array(
                array(
                    'key' => '_event_manager_id',
                    'value' => $id,
                ),
            ),
            'post_type' => $this->post_type,
            'posts_per_page' => '1',
        );

        $events = get_posts($args);

        if (is_wp_error($events) || !isset($events[0]->ID)) {
            return false;
        }

        return $events[0]->ID;
    }
Find an event by it's original id
@param int $id Event ID
@return Int|bool