ECP change query for list.php

    <?php //code to show only one of each event

	$args = array(
 	'post_type' => 'tribe_events',
	'showposts' => -1,
 	'meta_query' => array(
 		array(
 			'key' => '_EventStartDate',
 			'value' => date,
 			'compare' => '<'
 		),
 	)
  );

		 query_posts( $args );

		// also tried WP_Query - $evs = new WP_Query($args);


	?>