Oh, Greg, if you meant me when you referred to "multicultural compulsion" then I wish you would read such comments in context. Your wish to invite performers to your club or session is great and I have often wished (and expressed that wish) that we had more diversity in our clubs and festivals.   
But what I am trying very hard to say is that where a folk club wants to concentrate on traditional English music (and wants to define that in whatever way they choose) there should be no implicit or explicit interpretation that they would be a home for BNP supporters. As things stand, I can go to a Welsh language or Welsh folk music music event, an Irish language or Irish folk music event, Breton, Scottish, Bengali, Jamaican .... fill in the defining culture for yourself - and none of these will be under any kind of pressure to include other cultures. But make that "English" and all of a sudden we're slightly ashamed to put our heads over the parapet.

Make the choices you want. I too would go out of my way to hear South African black unaccompanied singers - although as people have a tendency to sing along in most UK folk clubs I wouldn't necessarily think that was the best venue for hearing their voices.

And I used the phrase "multicultural compulsion" because I have lived with that in my professional life for some time, both in teaching and in storytelling. Too often it's a matter of lipservice to qualify for funding or political approval rather than an intelligent choice. If you're making intelligent choices, I'm in your corner.