Sorting custom event list

Hey guys. I need a bit of help sorting a custom events list. I’m using this code to call events onto a page:

<?php if (class_exists('EM_Events')) {
	echo EM_Events::output( array(
		'limit'=>99,
		'orderby'=>'event_start_date,event_start_time',
		'format'=>'<li><a href="#_EVENTURL"><div class="dateBox"><span class="month">#M</span><span class="date">#j</span></div><div class="dateInfo"><h1>#_EVENTLINK</h1><h2>#_LOCATIONLINK</h2><h3>#_12HSTARTTIME</h3></div></a></li>'
	) );
	} ?>

I would like to be able to sort them by week (Sunday to Saturday). Perhaps having a dropdown menu at the top where users can select a week and then see the events that fall within that time frame.

Example dropdown:

June 29 – July 5
July 6 – July 12
July 13 – July 19
July 20 – July 26
etc.

Thanks for any help!

https://ww.wp.xz.cn/plugins/events-manager/