Answer:
The Celtic culture celebrated All Hallow's Eve around the time we celebrate Halloween. The Celts believed that on that day, spirits could return to the Earth and walk among the living. All Hallow's was also the Celtic New Year celebration. In the Middle Ages, people would fear Hallow's Eve, believing that demons went out to hunt on that night. As the centuries went on, people again adopted the tradition of going out on Hallow's Eve, but took on the Old English tradition of dressing up to scare away evil spirits.