Example of how to change the date format used within the datetime list.

functions.php

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

function tw_ee_add_dow_to_datetime_list( $date_format ) {

	//You can just add the 'l ' to the beginning of your current format like this:
	//return 'l ' . $date_format;
	
	//You can return a full date format to use like this:
	return 'l F j, Y';
}
add_filter( 'FHEE__espresso_list_of_event_dates__date_format', 'tw_ee_add_dow_to_datetime_list' );