Halloween or Hallowe'en (/ˌhæləˈwiːn, -oʊˈiːn, ˌhɑːl-/; a contraction of "All Hallows' Evening"), also known as Allhalloween, All Hallows' Eve, or All Saints' Eve, is a yearly celebration observed in a number of countries on 31 October, the eve of the Western Christian feast of All Hallows' Day...