Close commens on all events

gistfile1.txt

<?php
/*
* Plugin Name: Quick Event Manager Custom Snippet - Disable Comments on Events
*/
add_filter('comments_open', function ($open, $post_id) {
    $post = get_post($post_id);
    if ($post->post_type == 'event') {
        return false;
    }
    return $open;
}, 10, 2);