How to get the most past event and the most future event

Hello !
On list view, I’m trying to query event based on their month. I already know I can query by month like this :

$events = tribe_get_events( array(
	'start_date' => '2015-06-01 00:00',
	'end_date'   => '2015-06-30 23:59'
));

To display the available month, I’m using a carousel, like so . :

<(past) . July . August . September(current) . October . November . (future)>

I’m querying the current month via PHP basic function date().

My problem is that I need to query the furthest event back in time, and the furthest event forward in time, so that my carousel has a finite number of month, is it clear ?

How can I query those two events start date ?

Thanks ??