function addingCalendarWrapper()
{
	if(tribe_is_month())
	{
		echo '<div class="calendarwrapper">';
	}
}
add_action('tribe_events_before_the_grid', 'addingCalendarWrapper');


function closingCalendarWrapper()
{
	if(tribe_is_month())
	{
		echo '</div>';
	}
}
add_action('tribe_events_after_the_grid', 'closingCalendarWrapper', 500);