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Halloween, a holiday observed annually on October 31 and noted for its pagan origins and its Christian roots as well as its secular traditions. In much of Europe and most of North America, observance of Halloween is today largely nonreligious, celebrated with parties, spooky costumes, pumpkin carvings called jack-o’-lanterns, and trick or treat. Halloween also marks the beginning of Allhallowtide, a Christian triduum (Latin: “period of three days”) dedicated to remembering the dead that begins...