program_start_date
$meta_query = array( array( 'key' => 'program_start_date', 'compare' => 'EXISTS', ), array( 'key' => 'urgent', 'value' => 'true', 'compare' => '=', ), );
$meta_query = array( array( 'key' => 'program_start_date', 'compare' => 'EXISTS', ), array( 'key' => 'urgent', 'value' => 'true', 'compare' => '=', ), );