WP - Tribe Events Post Query

<?php
$args = array(
    "post_type" => 'tribe_events',
    "eventDisplay" => 'upcoming',
    'tax_query' => array(
                        array(
                          'taxonomy' => 'tribe_events_cat',
                          'field' => 'slug',
                          'terms' => array('meetings'),
              'operator' => 'NOT IN'
                )
   ),
    "posts_per_page" => '1',
    "start_date" => date('Y-m-d H:i:s', strtotime("now")),
    'orderby' => 'event_date',
    'order' => 'ASC'
);

$events = new WP_query($args);
?>