ECP_tribe_events_list_the_date_headers

<?php
if ( is_tag() ) {
	$term_id = get_query_var('tag_id');
	$taxonomy = 'post_tag';
	$args ='include=' . $term_id;
	$terms = get_terms( $taxonomy, $args );
	$tag_slug = $terms[0]->slug;
}
global $post;
$all_events = tribe_get_events ("tag=$tag_slug");

foreach ( $all_events as $post ) :
	setup_postdata ( $post );

	//reports errors and prints out month for 
	//each post.
	tribe_events_list_the_date_headers(); 
endforeach; ?>