Push long running events to bottom on home page

example.php

<?php
/*
* Reorder events so that the ones that are running over a long period 
* show up at the bottom of the list in a given view
*/
add_action( 'pre_get_posts', 'push_older_events_to_bottom', 500 );
function push_older_events_to_bottom( $query ) {

    if ( is_front_page() ) {
        $query->set( 'orderby', 'meta_value' );
        $query->set( 'meta_key', '_EventStartDate' );
        $query->set( 'order', 'DESC' );  
    }

    return $query;
}