The thing is I still like the idea of doing sessions/sing-a-rounds in pub bars.   It takes the music to a different audience.

Having said that, I do see the difficulties.

A story: I went to the opening of an Irsih bar once were the "turn" was Tom Napper & Tony Wilson (two excellent musicians/singers from the northeast of England).
The audience was mainly drinkers.

The audience kept asking for requests - useually Pogues songs. (By the way I like the Pogues)

Tom kept giving these people slips of paper and telling them to write their requests down and they would go into a hat.   Every so often he would pull out a peice of paper an announce the next song.

Needless to say they didn't change one song on the set - but everyone was happy.

Paulo