It was the Charlotte NC (University City) location. The staff was friendly but had no information. Fortunately for me it's just a few minutes from my home, but I would hate to have driven across town for it. If there was a last-minute change-of-location none of the four of us received any notifications and I believe we had all pre-registered.
As mentioned by others, it's organized and put on by Line 6 so I'm not surprised local staff had no knowledge. So no knock on GC intended here.