To add to Steve Shaw's summary (29 Oct 17 - 06:31 PM):

FOLK CLUB

Raffle.

PUB SESSION

Tip jar.

(and if anything tells a new arrival that the conversation at the bar is going to be about hip replacements, it's having a raffle. Who started that? I kinda doubt it was MacColl since his paradigm performance situation was the theatrical show, and you didn't get a raffle at the interval when Ibsen or Brecht were running the gig).

These days I am mostly playing music that may be rehearsed in a back room pub session or in somebody's house, but the focus is on doing it publicly at some point. I see little interest in playing anything unless I'm trying to win over an audience which won't have heard anything like it before. Pub sessions can do that, but there are many other alternatives.