What time do you have to arrive to sign up for open mic performances? And how much

There is an open jam on Saturday starts at 12:30 goes to 5:30 and on Sunday it's 1:00 to 6:00......they're free to attend and also to participate in. You just put your name on the board. It's a lot of fun

Call them

I would call the main line as prices change and so can tkmes

Sorry, I don't know but I think it is free. You might call.