What happened on October 31?

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  Halloween Mysteries & Phenomena

  A festival held on October 31. Its origin is said to be "Samhain," celebrated by the ancient Celts at the end of summer, when the spirits of the dead and monsters were thought to return to this world. Jack-o'-lanterns, costumes and trick-or-treating spread mainly in America.

Events based on the old lunar calendar, or festivals whose dates vary by year, are shown on approximate dates.