It's a real shame that so many of the plant societies and clubs (daylily, iris, succulent, etc) don't keep their sites updated and provide info on line. I've heard there was a cacti and succulent society that meets here in Knoxville, but, even after quite a bit of effort, I still haven't been able to tell for sure if they still hold meetings.

Try this: Call Darnell Hester, Middle Tennessee Iris Society President, at 615-384-6593. I think he will be able to give you this info or at least put you into contact with someone that can.