At the risk of this devolving into a "What is Folk?" exchange (can't avoid it but we can hope it doesn't dominate)

When do 'Catters make the assessment that a Festival has entered the blurry threshold that makes them question the right to use the word Folk in the title. Or do we see a slippery slope that leads all the way down very quickly to mass entertainment. I have my own candidates but this was prompted by a comment that Cambridge (not been personally) is no longer a Folk Festival.

OK? Whats your threshold? - (gets back behind parapet and waits for the flash)