http://www.arrl.org/hamfests.html
Not EVERY hamfest will be listed there, but I would guess that most will be listed there. Here is a summery of the next few listed for SC, more info is at the link after you search for SC.....
10-4-08
Rock Hill Hamfest and Computer Expo
York County Amateur Radio Society (YCARS)
http://www.rockhillhamfest.com
10-23-08
Sumter "OPEN-AIR" Hamfest
Sumter Amateur Radio Association
http://www.geocities.com/CapeCanave...adio Club
[url]http://www.w4gs.org/beachfest/
1-10-09
Greenwood Hamfest
Greenwood Amateur Radio Society
http://www.w4gwd.org
2-7-09
Charleston Hamfest & Computer Show--South Carolina State Convention
Charleston Amateur Radio Society
http://www.wa4usn.org