I think discussions of definitions can be interesting, the problems seem to arise for various reasons, including the tendency of such discussions to turn into slanging matches. I think discussion will crop up regularly on forums like this as new people enter and try to get involved; tricky to see how it can be avoided. Even more tricky to keep it reasonably, err reasonable.

Would it be fair to say that there is currently a range of different 'offerings' (can't think of better word just now) in a given area, so eg round here you find blues (a type of folk on some definitions), Irish, open-mike with very broad range of genres, probably some other specialist even non European ethnic/cultural clubs, probably some people attend more than one, some people specialise?