Filter WP_query by category

I need to filter the events feed on my site by the featured category. I’m using WP_query to do the feed in a custom template. It works fine until I add the category. Below is the $args I’m using. Did I not set them up them correctly?

$args = array(
			'post_type' => 'events', // enter your custom post type
			'meta_key' => 'start_date',
			'orderby' => 'meta_value',
			'order' => 'DESC',
			'posts_per_page'=> '4',
			'tax_query' => array(
				         array(
					'taxonomy' => 'event-categories',
				        'field' => 'term_id',
	            			'terms' => '59',
					),
					), 
			);

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