It's semi-formal, but of course we want you to be comfortable :)
Yes! Parking is available for all our guests. You can tell at the entrance of the Arb that you are a guest in our wedding. Then, you mention the "Snyder Auditorium" in order to know how to get to the closest parking.
Yes, if you want, you can leave the car at the Arb and pick it up at the next day, and at any time, from 8 am to 8 pm :)