I used to be a member of Central Oklahoma F-Body Association (COFBA), but I think it disbanded after production stopped on the 4th Gens. You can google COFBA to see if you get the same impression.
Please check out Camaro5's regional forum
Also on this site: Oklahoma Camaro Group
. There was a small gathering of members not to long ago - make sure you check in and say "Hi" and I'll be they will send you a PM if another meet is scheduled.
There is a club called Oklahoma General Motors Performance
(OKGMP) and they are having what sounds like a BIG show in Oklahoma City on Oct 3, 2009