WEll I am delighted to say I have just platyed at Glastonbury festival(England's biggest, I think?). It is big but it has hundreds(literally) of venues of all sizes. And all genres of music are represented, and the same stages often put on lots of kinds of music, so for one glorious long weeken classification breaks down and means little or nothing.Sociability starts to define lifew, rather than tribal affiliations. I play my gigs, and otherwise wander around and just hear stuff serendipitously.Great, and for a while it doesnt matter at all whether you call it folk.    Incidentally, as there is a nice cross-Atlantic mix on this thread: the most interesting new band I heard were absolutely fabulous Americans, called These Unites States. Anybody know them? Would they be called folk, or rock, or what, in the USAS? Do enlighten me, if you've heard of them. They were three of them,young, bearded, and in some strange magical way a bit reminiscent of the Band in the early days, not musically but sort of historically.The lead singer was called Jesse Elliott, as far as I can recall.
Anyway, for that wee moment in time, genres didn't matter at all, which is why I like mixed festivals more than folk festivals generally. AS long as there is plenty of folk of course!