Halloween celebrations originated over 2000 years ago among the ancient Celts, who celebrated a festival called Samhain on October 31st to commemorate the spirits of the dead. They believed spirits visited the living on this night and wore scary masks to ward off evil spirits. Later, in the 800s, Pope Boniface IV established All Saints' Day on November 1st, with the night before being called All Hallows Eve, which eventually became Halloween. Today, Halloween traditions include children dressing in costumes and going trick-or-treating by knocking on doors asking for candy, as well as carving jack-o-lanterns from pumpkins to honor the Irish legend of Stingy Jack.