I did double check Gracey's log book and she was there on time after all (maths are so confusing! /boggle). She mentioned in her diary that a couple folks came to see her and tested out the track -- one of them even put up a quick message on the special "crafting" frequency that many of you use, but sadly she said that no one else came out to see her after the initial three.
I've asked that when she goes out there tonight at 9pm to see if she can't stick around for a couple of hours and she thought that was a splendid idea indeed. She said to mention that if you don't find her working on the track near the Racing Referee, you might also find her shopping at the City Festival, so keep your eyes peeled in both locations!