Whatever works best for you. I'm sure no one will try to give you sh1t for ducking out early!
I used to go to multiple nascar races every year with a group of friends when I lived back east. We would camp out for the weekend, and they pretty much turned into Roman drinking festivals. Some of the most fun I've ever had. My friend even had us all go to the Daytona 500 for his bachelor party 2 years ago. Man, I miss that stuff.
