Just had a great night tonight in Louisville, KY at this open mic. Signup started at around 8pm and the music usually starts at around 8.30 or so, but was delayed because of a local ball game. Despite that, the house band kicked off without tooooo much waiting and I was simply really impressed. They're tight and talented and are able to back other performers if you ask - full kit, bass and electric amp in the house - but no-one's chagrined if you want to play solo.
3 songs or so, typical bar menu - this is NOT really a "listening" room, but there is division between the tv watching bar crowd and the music watching bar crowd, and it feels more intimate than the space initially projected.
Friendly host (though I got the impression he wasn't the regular guy?) and friendly audience. It's listed as a "jam", but it's more structured than that.
Good time had!