It depends, I guess, on what 'folkvix' meant when he said 'traditional events'; but a version of 'John Barleycorn' is sung in the run-up to the Haxey Hood Game (Ruth has already mentioned 'Farmer's Boy' in that context) and that's a sight more traditional than folk clubs or folk festivals; or modern pub sessions, which is what 'Mr Happy' presumably meant when he said 'sesh' (not a very helpful term to use when talking to an American student).