I don't think that what unnamed guest says is true. My girlfriend is universally welcomed as far as I can see. Another folk camp I go to sees a gentleman of I think Indian (maybe Iranian - I've never found it necessary to ask) extraction who performs his own songs and is welcome, and the adopted "BAME" daughter of another attendee who sings mostly gospel and religious songs and is also welcome. There are several young performers at a professional level who are not WASP.

Scarcity there may be - but mostly racism there is not (I think).

Mind you I remember without affection at an open mic I went to, a "BAME" attendee wanted to use backing tracks which took an age to set up and then murdered some Bob Marley songs.   OTOH he was not as bad as the white Englishman with dreadlocks who apparently seriously sang "Jolene", badly accompanied by himself on guitar!