NC and Tennessee area is EMSA (Eastern Multihull Sailing Association).
http://www.emsa-sailing.org There's not a whole lot going on in Tennessee. Theres a bit in N.C. (Charlotte, Raleigh, Hattaras areas), and a good bit in S.C. and G.A. (Hartwell, GA (Spring Fever); Atlanta, GA, Seneca, SC, Columbia, SC, Charleston, SC, etc.).