By the time race got started the stands were pretty well full, with few empty seats-- at least where we were. We got there much too early (4 PM) and until the crowds showed up it was much too cold. We froze our little butts off in that cold wind.
We had a great time nonetheless, and my two were such stalwarts, insisting on staying through the worsening cold as long as possible. In the end it was sleepiness that started to take it's toll -- S4 fell asleep on my lap, and then S8 started to get real still too. I kept checking on him, gently warning him I had no intention of trying to carry the both of them back to the car. So we ended up leaving early and watched the remainder of the race from the toasty warm convenience of our hotel room.