Sorry "some bloke". If musicians, dancers and singers turn up. meet, and do their "thing" at an agreed location, that is a "festival", not a "fringe". There is no need for concerts at all, workshops may be a welcome addition or not. The only organisation needed for a truly "folk" festival is that "folk" agree when and where it is to happen. A bit like a flash mob, only much longer.
This is not to say that I/we don't appreciate all the work that goes into making a much bigger event of a festival, or the work put in to attempt to start off a regular event. I will never forget the amazing Wheaton Aston festival, where there was a session in the pub and the most amazing young bands played in the back, so that if you heard something you liked you stopped playing and went out to listen. And yet the organiserwonderful event of this could never get enough support.
But the real measure of a festival is not how many bums there were on seats in the concerts, but how many learnt new tunes, learnt new ways of playing, learnt more to bolster their love of the "folk" (or as sme say now "community") arts.