Incidentally
Folk clubs wen't "invented" for anything specific - they evolved spontaneously - nobody is sure where
They seemed to be the natural progression of something that was already beginning to happen
MacColl's crowd wtth the than exiled Alan Lomax started a couple of concerts at The Theatre Royal in East London - Ewan always claimed that was the first but that has always been disputed
The main objective was to air the music rather than display platforms for people who had already carved their names elsewhere
Different aprts of the country reacted differently
The Folk Boom introduced a scramble for the top
Mike Brocken's extremely flawed history covered that period reasonably accurately