People are invited to Wal-Mart's first annual Trunk or Treat event held at the store, 2460 Lafayette Rd. in Portsmouth NH. You can participate by entering your vehicle which involves decorating your trunk and dressing up in costume usually matching the theme of your vehicle and handing out candy to the trick or treaters! Or you can just bring your family to trick or treat from trunk to trunk and enjoy a safe trick or treating experience! Prizes