I see lunchtime/afternoon sessions at several venues and one venue having a session/singaround in the evening. Is there a demand for more than that? (Jack Campin)

That's often the problem. What's advertised as a session (I'm not necessarily talking about Middlewich of which I know nothing) quite often turns out to be a band performance in all but name. A session isn't just playing along with a lead musician; a good session is like a conversation, involving give and take, and does not have a predetermined agenda.