Updates timezone for tribe_events post type

db_update_event_timezones

add_action( 'wp_loaded', 'gsandf_update_event_timezones' );
function gsandf_update_event_timezones() {
  $args = array(
    'posts_per_page' => -1,
  );
  $events = tribe_get_events( $args );

  foreach ( $events as $event ) {
    update_post_meta( $event->ID, '_EventTimezone', 'America/New_York');
    update_post_meta( $event->ID, '_EventTimezoneAbbr', 'EDT');
  }
}