Morning, El Senor Gnomo. Most of the clubs I've been to lately seem to be all around your number 3 - sometimes alternating between guest/floorsinger weeks and open-stage weeks, or sometimes where the open-stage nights are less frequent. I was up at the Sandbach club in Cheshire this week, and they appear to run on the alternating basis. There is one notable exception locally (Sussex), the fortnightly Six Bells Folk and Blues at Chiddingly, which rarely has guests but has a regular open-stage - and attracts some good performers most sessions. I like both types myself - and the open-stage nights with a small charge on the door obviously help to pay for the guests.