Get posts in custom taxonomy category?

Hi,

I want to get posts in custom taxonomy category, I have code below but it show nothing, could you please check it for me? I want to get post with slug events in wg_category

$args=array(
	'post_type' => wg_get_deal_post_type(),
	'post_status' => 'publish',
	'paged' => $paged,
	'tax_query'	=> array(
		array(
			'taxonomy'  => 'wg_category',
			'field'     => 'slug',
			'terms'     => 'events',
			),
		),
	'meta_query' => array(
		array(
			'key' => '_expiration_date',
			'value' => array(0, current_time('timestamp')),
			'compare' => 'BETWEEN'
		)),
);

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And I also want a code to not display featured on other query, is the code 'operator'  => 'NOT IN' correct?

$args=array(
	'post_type' => wg_get_deal_post_type(),
	'post_status' => 'publish',
	'paged' => $paged,
	'tax_query'	=> array(
		array(
			'taxonomy'  => 'wg_category',
			'field'     => 'slug',
			'terms'     => 'featured',
			'operator'  => 'NOT IN'
			),
		),
	'meta_query' => array(
		array(
			'key' => '_expiration_date',
			'value' => array(0, current_time('timestamp')),
			'compare' => 'BETWEEN'
		)),
);

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Thank you