Example of how to add a default description to EE events.

tw_ee_default_post_content.php

<?php // Please do not add the opening PHP tag if you already have one

add_filter('default_content', 'tw_ee_default_post_content', 2, 10);
function tw_ee_default_post_content($post_content, $post){
	if(get_post_type($post) == 'espresso_events'){
		$post_content = 'Add your default EE post content here';
	}
	return $post_content;
}