Halloweenis an annual holidaycelebratedeach year on October 31, andHalloween2018 occurs on Wednesday, October 31. It originated with the ancient Celtic festival of Samhain, when people would light bonfires and wear costumes to ward off ghosts. ... The evening before was known as All Hallows Eve, and laterHalloween.Halloween or Hallowe'en also known as Allhalloween, All Hallows' Eve, or All Saints' Eve, is a celebration observed in several countries...Significance:First day ofAllhallowtideDate:31 OctoberAlso called:Hallowe'en; Allhallowe'en; All Hallows' Eve; All Saints' Eve