A friend (talented whistle/recorder player) has just had a bit a falling-out with a larger group she joined. The group were only going to be playing at a local folk club, but she'd approached it as a performance, which means practising together, working out dynamics, arranging who does what when, etc.. In other words, being professional about it as a performance, and trying to do the absolute best you can for your audience. But they all apparently considered it to be just an opportunity to play session-style with a captive audience, so new people kept being added, there were no real group practises and they weren't keen on working through the dynamics of the tunes. Hence the falling-out when she tried to get them to shape up.

If all you want is a bit of session-style playing, then fine. But that's not a band in any sense of the word - it's hardly even a group, because "group" requires a cohesive identity. So you might want to check that everyone's plans of what you're setting out to do are the same.

Graham.