Halloween originated over 2000 years ago when the Catholic Church designated November 1st as All Hallows Day. Celtic traditions evolved Halloween into a festival on October 31st where people would dress in costumes and carry carved pumpkins or carrots to ward off spirits returning to earth. Over time, Halloween evolved into a celebration where people dress in costumes and go trick-or-treating, carving pumpkins became a tradition, and the holiday spread and grew in popularity around the world.