It is the night of October 31, and hundreds of people have gathered at the Hill of Ward, in County Meath, Ireland. Some wear robes and masks and carry torches and banners emblazoned with spiritual symbols. It is all part of a revival of the ancient Celtic festival called Samhain that includes processions, chanting, and storytelling. The Hill of Ward was one of the main spiritual centers for the ancient Celts, and Samhain was first celebrated at the same time of year millennia ago. New archaeological work is looking closely at the history of the Hill of Ward, which until recently had been overlooked in Ireland’s archaeologically rich Boyne Valley. Researchers are hoping to discover how its use and value evolved over the centuries—along with the traditional rites and celebrations that eventually led to the modern festival of Halloween.
http://www.archaeology.org/issues/232-1611/features/4940-ireland-halloween-roots