Hi John,
Sorry it took me so long to reply. I've been busy getting ready for our trip to the left coast.
About the only help I can provide regarding the Atlanta cajun music scene would be the above link to the Atlanta Cajun Dance Association. They usually host some pretty good acts throughout the year. Ray Abshire, Steve Riley, etc. Also, check with Larry English, who posts here. I believe he's in a local band here and may be of more assistance.