So what kind of media Vikings have in the past, when nearly nobody even know how to write/read? And even before in Celtic population? Did you know Halloween ori

So what kind of media Vikings have in the past, when nearly nobody even know how to write/read? And even before in Celtic population? Did you know Halloween origin? Did you know that a traditional Celtic fest in which people of a village start to form semi-random couples and live together for an year, if it work they remain together if not another (semi-orgiastic) turn? Or ancient Roman's Baccanals? Or ancient Greeks orgy, often homosexual and/or pedophile?