How many attendees (WooTickets 1.0.1)

/**
 * This could be added within the cart contents loop (in WooCommerce 2.0.7
 * it starts at line 119 in review-order.php) to sum the number of event attendees.
 *
 * Later on you could use that to generate the corresponding number of attendee
 * data fields.
 */
if (get_post_meta($_product->id, '_tribe_wooticket_for_event') > 0)
    $attendee_count += $values['quantity'];