There may not be anything quite like the Mudcat Cafe.

However, if you select [Links] from the choices at the top of the main Mudcat forum page, you'll find sites for lots of other types of music and can check them out as to whether there's any real conversation/give-and-take. Some of them have visitors' comments at least. "Cowpie" may have a discussion forum for C&W, check it out.