There were supposedly over 40,000 tickets sold and it looked like there were tens of thousands of people there. However the crowd wasn't very diverse, it was almost all white guys and white gals. I was the only black person I saw the entire 5.5 hours we were there.
Besides Kenny Chesney there was also Gretchen Wilson, Dierks Bentley's, Big & Rich, and a surprise appearance by Uncle Kracker. The crowd seemed to get into all the performances although it was hard for me to since I didn't know most of the songs.
I think I saw someone with the worst job in America. One of the concert goers vomited and it seems there were no safety cones available so one of the stadium employees stood over the vomit so that concert goers wouldn't step on it.
Unlike hip hop concerts this one started on time. We got there at 5:30PM and we had already missed half of Dierks Bentley's set. Not only did it start early, it ran until 11 PM which means we got our money's worth.
This was the largest gathering of people wearing cowboy hats I'd ever seen. This was doubly a surprise given how rarely one encounters cowboy hats in Seattle.