Return all events

function.php

function GetUpcomingEvents() {
	$events = array();
	$index  = 0;
	$today  = date( "m/d/Y" );
	$args   = array(
		'post_type' => 'events',
		'post_status' => 'publish',
		'posts_per_page' => - 1,
		'meta_key' => 'event_start_date',
    'orderby'   => 'event_start_date',
    'order' => 'ASC',
		// 'meta_query' => array(
		// 	array(
		// 		'key' => 'event_end_date',
		// 		'compare' => '>=',
		// 		'value' => $today,
		// 		//'type' => 'numeric'
		// 	)
		// )
	);

//	    $posts_args = get_posts( $args );
//	    echo '<pre>' . print_r( $posts_args, true ) . '</pre>';

	$query = new WP_Query( $args );

	while ( $query->have_posts() ) {
		$query->the_post();
		$event_id                               = $query->post->ID;
		$events[ $index ][ 'event_id' ]         = $event_id;
		$events[ $index ][ 'event_title' ]      = $query->post->post_title;
		$events[ $index ][ 'event_content' ]    = $query->post->post_content; //ExtractContent($query->post->post_content, 150);
		$events[ $index ][ 'event_start_date' ] = get_post_meta( $event_id, 'event_start_date', true );
		$events[ $index ][ 'event_end_date' ]   = get_post_meta( $event_id, 'event_end_date', true );
		$events[ $index ][ 'event_location' ]   = get_post_meta( $event_id, 'event_location', true );
		$events[ $index ][ 'event_link' ]       = get_post_meta( $event_id, 'event_link', true );
		$index ++;
	}

	usort($events, "cmp");
	return $events;
}

function cmp($a, $b)
{
	$adt = new DateTime($a['event_start_date']);
	$ats = $adt->getTimestamp();
	// echo 
	$bdt = new DateTime($b['event_start_date']);
	$bts = $bdt->getTimestamp();	
	return strcmp($ats, $bts);
}