Yeah, that was quite the odd choice of location for an OB rally that was originally advertised as "Southeast". You may have noticed that shortly after they posted it, they removed the "Southeast" labelling and just called it "Ozarks" – assumedly, in response to all of the Southeast folks who were baffled.
It would literally take less time to drive to the Ozarks from Cheyenne, WY than from Upstate SC. And I'm 3+ hours inland! For anyone on the coast of the Carolinas or Georgia, or almost anyone in Florida, it'd be equally accurate to have called it "OB Rally Northwest".