Jim,
In answer to your question about an open mic "pop" venue,I have no idea, try it you might be surprised.
L am assumming that by "pop" you mean music aimed at the top ten hits list past or present.
If you are refering to the sort of club which is not worthy,in your eyes of calling itself a folk club, again I have no idea of what any particular audiences reaction might be,but again I think you might be surprised