A good set of questions.
I agree that there are lots of people performing in folk clubs from non-English backgrounds/ancestry but guess what - they are all white!

So to put this issue in the open, I think that the folk world is institutionally racist.

I almost never see a black singer or musician or audience member in a folk club, (not since the 60s anyway) but I know the singers are out there at Open Mic nights, and I think we need to do something to encourage them.