Halloween, the last day of October, has a special significance for children, who dress in funny or ghostly costumes and knock on neighborhood doors shouting "Trick or Treat!" Pirates and princesses, ghosts and witches all hold bags open to catch the candy or other goodies that the neighbors drop in.
Since the 800's November 1st is a religious holiday known as All Saints' Day. The Mass that was said on this day was called Allhallowmas. The evening before became known as All Hallow e'en, or Halloween. Like some other American celebrations, its origins lie in both pre-Christian and Christian customs.