Halloween or Hallowe'en is a tradition celebrated on the night of October 31, most notably by children dressing in costumes and going door-to-door collecting sweets, fruit, and other treats. Apart from this trick-or-treating, there are many other traditional Halloween activities. Some of these include costume parties, watching horror films, going to "haunted" houses, and traditional autumn activities such as hayrides, some of these even "haunted".
Halloween originated under a different name as a pagan festival among the Celts of Ireland and Great Britain. Halloween is celebrated in most parts of the Western world, most commonly in the United States, Canada, the UK, Ireland, Peru , and with increasing popularity in Australia and New Zealand. In recent years, Halloween has also been celebrated in parts of Western Europe, such as Belgium, France and Spain. The holiday was a day of religious festivities in various northern European Pagan traditions, until Popes Gregory III and Gregory IV moved the old Christian feast of All Saints' Day from May 13 to November 1.