WP Query Category or Custom post

Hello,

I am trying to figure out how to return posts from WP query that are in one of 3 categories OR a particular post type. Here is the code I am starting with:

<?php
	global $post;
	$querycs_args = array(
	  'posts_per_page' => 3,
	  'category_name' => 'case-studies,videos,white-papers',
          'post_type' => 'event'
	);

        $querycs = new WP_Query( $querycs_args );
?>

<?php
if( $querycs->have_posts() ) : while( $querycs->have_posts() ) : $querycs->the_post();
?>