Recurring events in wp-admin: only display first (parent) occurrence in list of Events (i.e. hide child recurring events)

functions.php

<?php

/*
 * Recurring events in wp-admin: only display first (parent) occurrence in list of Events
 * (i.e. hide child recurring events)
 * 
 * From https://theeventscalendar.com/knowledgebase/hide-recurring-event-instances-in-admin/
 * - https://gist.github.com/cliffordp/81f23a207ab483c9e7c6d910f9b29c0a
 * 2016-07-04 Barry shared this snippet from a previous customer's own/shared customization
 * 
 */

class Events_Admin_List__Remove_Child_Events {
    public function __construct() {
        // Don't kick in unless we're on the edit.php screen
        add_action( 'load-edit.php', array( $this, 'setup' ) );
    }

    public function setup() {
        // Listen out for the main events query
        if ( 'tribe_events' === $GLOBALS[ 'typenow' ] )
            add_action( 'parse_query', array( $this, 'modify' ) );
    }

    function modify( WP_Query $query ) {
        // Run once, only for the main query
        if ( ! $query->is_main_query() ) return;
        remove_action( 'parse_query', array( $this, 'modify') );

        // Only return top level posts as a means of ignoring child posts
        $query->set( 'post_parent', 0 );
    }
}

new Events_Admin_List__Remove_Child_Events;