As usual the singers have tried to hijack this thread which is about INSTRUMENTAL sessions hence the mentioning of Guitars and Bodhrans.

This space thing is very important. When I play the Bodhran I try to occupy the really low bass end of things and not clutter up the space occupied by tune players.
I think the one at a time is best for Guitars and Bodhrans and if there are other players at the session something gets worked out, usually without a word being spoken.
I will sometimes play while some one else is playing at large (long) sessions to help people stay together but then I keep it very simple.

TTFN
PP