Roger, I found a couple of passing references to a Hazzard Homecoming event in Covington on May 7th & 8th, which would be this weekend, but I couldn't find a website or any definitive information.
There's a separate event called Hazzard Fest taking place at Greene County Fairgrounds in Greeneville, TN on September 23rd and 24th (that's Friday & Saturday). Details of that can be found here. They're advertising Catherine Bach (Sept. 23rd & 24th), John Schneider (Sept. 24th - Concert), Tom Wopat (Sept. 23rd & 24th) and Rick Hurst (Sept. 23rd & 24th). There's also Angelo Lamonea (Sept. 23rd & 24th) who performed stunts on 'Dukes' and 'Enos'.