Sorry, there, Strollin' -- I somehow missed (or distractedly skimmed through) Marje's earlier message making the exact same point I repeated a week later. If I was the cause of further contention and misunderstanding, I apologize.
If Villan and his Folk Club set up their schedule ahead of time, so be it -- I certainly have no reason to criticize them. I was just concerned with the meaning of "open mike."