

The early pagan holiday of Samhain involved a lot of ritualistic ceremonies to connect to spirits, as the Celts were polytheistic. While there isn't a lot of detail known about these celebrations, many believe the Celts celebrated in costume (granted, they were likely as simple as animal hides) as a disguise against ghosts, enjoyed special feasts, and made lanterns by hollowing out gourds (hence, the history of jack-o'-lanterns).