Querying posts by date meta_key, excluding posts whose date has passed

I’ve hit a wall on a WP_Query and was hoping somebody could give me a hand.

I’m using the Advanced Custom Fields plugin to create a Events custom post type, which includes a meta_key for when the event starts and ends. I want to query all events with an end date that has not passed yet, and sort those events chronologically. This is what I got:

<?php

	$args = array(
	    'post_type' => 'events',
		'post_status' => 'publish',
		'posts_per_page' => -1,
		'meta_query' => array(
			array(
				'key' => 'event_end',
				'compare' => '>=',
				'type' => 'DATE',
				'value' => date('Y-m-d')
				)
			),
		'meta_key' => 'event_end',
		'orderby' => 'meta_value',
		'order' => 'ASC'
	);
?>

No posts are returned. When I remove the meta_query section, all posts are returned and sorted correctly. The problem is somewhere in the meta_query part, but I can’t figure out what it is. The event_end dates are correctly formatted (YYYY-MM-DD).

Any help is very appreciated.

— Anders