they believed that on the night before the new year, the boundary between the worlds of the living and the dead became blurred. Otherworldly spirits who came to visit would cause trouble and damage crops, but their presence also helped the Druids, the Celtic priests, to make predictions about the future. Since their people were entirely dependent on the volatile natural world, these prophecies were an important source of comfort and direction during the long, dark winter.
All hearth fires were extinguished and the Druids built huge sacred bonfires, where the people, in costumes gathered to burn crops and animals as sacrifices to the Celtic deities. They also attempted to tell each others fortunes. When the celebration was over, they re-lit their hearth fires, which they had extinguished earlier that evening, from the sacred bonfire to help protect them during the coming winter.
Feralia, when the Romans traditionally commemorated the passing of the dead, and a day to honor
Later, the church made November 2 All Souls' Day, a day to honor the dead. Its celebration was similar to Samhain, with big bonfires, parades, and dressing up in costumes as saints, angels, and devils.