I think you need to decide whether you want a folk club (which may welcome other performers and in my experience most do) or a "contemporary music club" most of which I think regard traditional song with considerable suspicion, and while perhaps assisting in the survival of the notion of music as something in which people participate (which becomes doubtful as soon as PA turns up) does little even to assist in enabling people in understanding or participating in their own traditions (or roots) much less in the survivla of those roots or traditions.

I may not be a brilliant performer, but I get by, and I did for a bit of a laugh go to a local pub which had open mic. I had checked it out previously and the material was contemporary, but mostly on acoustic guitar etc. It seemed openminded. As became evident, nothing written longer ago than the 80s was welcome. The audience didn't know it and didn't want to. Not a matter of standard of performance: they welcomed players of very limited ability. A matter of age of the material. But there were lots of people there.

If you want to go there, do so. But in my opinion it is not a "folk club". Folk music is not simply entertainment to be marketed to consumers. As one of the excellent and very traditional sounding songs by Pig's Ear (Kent based folk group of many virtues) puts it "we remember the old ways". They also do contemporary-sounding songs ("Sausage") but the roots are largely in the old ways. That is a folk club.