Gear check is really dependent on the weather, how you got to the race, and what you are doing after it.
I personally like certain things post race (like an EAS protein shake, a powerade zero), and like to have dry socks, different shoes, and a dry shirt. If it's cold out, a dry sweatshirt is nice too.
If you are taking the bus, or there with others and may be waiting for them to finish, it's nice to have your stuff.
However, if you are driving to the race and going straight back to your car, you might not need anything or be able to keep it in your car.
I personally like certain things post race (like an EAS protein shake, a powerade zero), and like to have dry socks, different shoes, and a dry shirt. If it's cold out, a dry sweatshirt is nice too.
If you are taking the bus, or there with others and may be waiting for them to finish, it's nice to have your stuff.
However, if you are driving to the race and going straight back to your car, you might not need anything or be able to keep it in your car.