Halloween celebrations in the United Kingdom include parties where guests are often expected to arrive in a costume to reflect the day's theme. Other people gather together to watch horror films, either at home or at a cinema.
Some children go trick-or-treating. This means that they dress up and go to other peoples' houses, knocking on the door for treat of sweets or a snack. Those who do not give out a treat may be tricked with a joke instead.
Halloween has its origins in pagan festivals in England, Scotland, Wales and Ireland. Many stores and businesses see Halloween as a chance to promote products with a Halloween
