Halloween may have originated from the ancient Celtic festival of Samhain, marking the new year on November 1, when spirits were believed to roam the earth. The holiday was later merged with Roman and Christian traditions such as All Saints’ Day. Shop Spirit Halloween for an incredible selection of Halloween Costumes, Halloween Decorations, Halloween Accessories, and Halloween Makeup. Fast shipping & huge selection! During Halloween, one of the world’s oldest holidays, the U.S., England, Ireland and Mexico celebrate with unique traditions and activities. Halloween originated with the ancient Celtic. The following are a select few Halloween traditions, some still observed and others that have become relics of the past, along with some “fun facts” about Halloween, to add to this year’s Halloween fun. 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 is a holiday celebrated each year on October 31. The tradition originated with the ancient Celtic festival of Samhain, when people would light bonfires and wear costumes to ward off. Halloween, [a] also known as All Hallows' Eve, [9] or All Saints' Eve, [10] is a celebration observed in many countries on 31 October, the eve of the Western Christian feast of All Hallows' Day.