Many Americans celebrate Halloween on October 31. Celebrations include costume parties and trick-or-treating.
Halloween originated as a pagan festival in parts of Northern Europe, particularly around what is now the United Kingdom. Many European cultural traditions hold that Halloween is a time when magic is most potent and spirits can make contact with the physical world. In Christian times, it became a celebration of the evening before All Saints’ Day. Immigrants from Scotland and Ireland brought the holiday to the United States.