Stewart, maybe you are getting the wrong impression. I have stated my observations and I do have a strong preference for instrumental sessions but I enjoy the other things as well.

At the moment I go to:

A purely instrumental Irish session.

A mixed event although a lot more singing than instrumental which I wouldn't call a session as someone organises who is next.

An Irish night which is more of a social event but we have a bit of a session and some people sing.

I occasionally attend a folk club on a singers night.

The only one I never sing in is the Irish session. I can get something out of all of them. It really is a case of knowing what an event is about and trying to do things that are appropriate for the venue (all of which are very friendly places BTW).

Jon