At the moment the weather doesn't look good for Saturday, but it's far too early to make that call for sure. I do know that the CCA HQ grass field is a nightmare in the wet as the 50th O'fest 2019 final night event it rained, and I was fortunate that I live 20min away and I had brought the E91 that night with all-season (PSAS3+) tires on it. It was still a harrowing ordeal to get out of the muck without being towed...really glad I made the decision to drive the beater that night (the huge grass field slopes down to a lake).
One drive I really enjoy locally is highway 276 up to
Cesar's Head from the Greenville side (from highway 11). It goes from 1165ft elevation at highway 11 to 3159ft at Cesars Head State Park at the top over ~5-6 miles of road. It has short sections of two upbound lanes to allow you to get around slow traffic in many areas, and the very tight uphill switchbacks are a blast. I just drove it Friday in fact (about 25 min from here in north Greenville county).
None of the mountain drives are much fun on crowded weekend days, especially now when everyone seems to be getting out.
I hope the weather holds and Saturday turns out nice. It would great to meet up with everyone.