Using Modern Tribe's "The Event Calendar". Just a simple <div> wrapper for a span. Nothing more, nothing less.

the-events-calendar-filter.php

function wrap_event_spans($span){
	// The original spit out a <span> with the Month/Year at the top of each month, but...	
  	// there also seemed to be empty spans after each event
	// This screwed up the Foundation XY Grid I wanted to use in List View
	// So this is 2 birds one stone. Wrap the span, get rid of empty ones.
	if( !$span ){
		return;
	}
	$op = '<div class="whatever classes are needed">' . $span . '</div>';
	return $op;
}

add_filter( 'tribe_events_list_the_date_headers', 'wrap_event_spans' );