Just make sure no-one is playing who has an album or two on sale - you could be on dangerous copyright grounds!
Sully (Tony Sullivan) frequents sessions round our way, but he doesn't mind people recording for their own use. Needless to say (why do people say that!?), offering copies of the recording for sale is a definite 'no no' - unless it's just to the people who were there, and the others don't mind (ask their permission!), and you only cover the cost of the media.
I suppose I'm trying to say 'it just depends...'!!