Check out No Worries Wakeboarding in Alabama, They have 3 tournaments this year, first one is Saturday.
http://nasainc.net/noworries/nw.html There are also several tournaments in Chattanooga, TN area. Hyperlite Tour August 4&5, Between the Bridges August 11&12.
www.knoxwake.com has a listing with many tournament in the Southeast.