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Hallowe'en (October 31 - the last day in October) is not a statutory holiday, but it is a day when traditionally kids wear masks and/or costumes and beg for candy.
The name comes from the Old English: All Hallow's Eve
All Hallow's Day was November 1 in Old England.
The 'eve' (evening) of All Hallow's Day is the day before November 1.
Christmas Eve (December 24) is the day before Christmas.