- Events
-- Location
-- Date
- Region
-- State
-- StateCode

$terms = get_terms( array(
    'taxonomy' => 'events_category',
    'hide_empty' => false,
) );

foreach ($terms as $term) {
    if ($term->parent != 0) { // avoid parent categories
        $options[] = array('label' => $term->name, 'value' => $term->term_id, 'id' => $term->term_id);
    }
}