Disable author, excerpt and custom fields meta boxes in the event editor

tribe_disable_default_meta.php

<?php

// used for Tri.be The Events Calendar
// disable author, excerpt and custom fields meta boxes in the event editor
function tribe_disable_default_meta() {
	remove_post_type_support( TribeEvents::POSTTYPE, 'author' );
	remove_post_type_support( TribeEvents::POSTTYPE, 'custom-fields' );
	remove_post_type_support( TribeEvents::POSTTYPE, 'excerpt' );
}
add_action('init', 'tribe_disable_default_meta');