Sorry sticking to the point mentioned in the OP I forgot to mention in the first part of the last post regarding Clubs being a quaint British pastime. Had there been no Folk Clubs formed in the UK in the 1960s there would have been no "Folk Revival" in the UK as, due to commercialisation, there would have been nowhere where that music would have been played. The very first "folk club" I went to in the early to mid-60s was in the school I attended. The town itself did not have a folk club and as far as I am aware even until this day (In the height of this supposed 2018 UK Folk Revival) still does not have one.

The origins of the folk revival of the 60s came to the UK from the USA in the 50s in the form of Skiffle which had its roots in Jazz. Commercialisation killed off skiffle because they couldn't make any money out of it, there were something like 30,000 to 50,000 skiffle bands on the go in the UK at it's height. So skiffle died a death and evolved, the main thrust of that evolution became "pop" music, where things could be managed and manipulated and a great deal of money could be made. The same remains as the case today.