There really aren't too many Cajun box/fiddle/guitar players in the New Orleans area. Once a month a group of people get together at the Audubon Zoo for a jam on Sundays. I believe a few of the participators also read this discussion board and might be able to give better information than I can.
I know the guys and gals that play at the zoo if you want more info e-mail me and I'll get it to you. I live in Thibodaux and my wife and I play at home everyday. If you would want to drive here on a week end maybe we can do a jam at my house. I also know of other musicians in Mandeville area.