A day late, but a really good race. 9
I've been to around a half dozen rain delay days. A reduced number of gates and booths are common because the tracks didn’t schedule / pay anyone to work those positions. There's usually no one guiding cars in the lots. Ticket and cooler checking is minimal to non existent; bring what you want, sit where you want. Once the race starts, it's a truly surreal environment.
Normally this isn't a problem because I usually see only about 10% to 20% of the seats occupied. Looks like Michigan has some die hard fans! Maybe they didn't open the gates early enough?