I went to the races both Sat & Sunday. Sat was hot & humid and the attendance in the stands was down 'cuz they were hot. I have turn 15 grandstand seats, but spent most of Sat on the grassy hill overlooking turn 19 cuz it was cooler. Sunday attendance (and the weather) were both a lot better. Stands had more people. Sunday afternoon the stands were thin until just before the V8 race and then people came from everywhere. It was a good race weekend (but then, when isn't). Sunday crowd felt about the same as the GrandAm a couple of months ago. I ran into lots of Aussies and the local news said there were about 5,500 up to see the race with a total of about 65,000 people attending for the weekend.
Racing was a little more subdued than I have previously seen on the TV, but then each team was restricted to only bringing 2 small containers of parts, etc so I think they were saving the cars until the last race. The schedule was a little odd, with 1-2 hr breaks between some of the races, which included the Porsche GT3 cup and a couple of other races series, then they had the two V8 races back to back (with very little break) on both Sat & Sun (4 V8 races total). Seems to me that it would have been better to break them up, give the teams time to regroup, and also fill the dead time during the day. There were also lots of yellow flags which, with a short race, made the actual racing time much shorter.
BTW, they ran the short COTA track - not the long F1/GrandAm Track. Although it kept the cars coming by more often, it made for difficulty passing.
All-in-all: it was a good weekend at the races. Some photos follow.
John