WordCampers can use both the Ohio Union Garage North and the Ohio Union Garage South for parking.
Parking is free for Saturday. When you arrive, take a ticket to get access to the garage. Pre-paid tickets will be available at WordCamp for all attendees at the registration desk. All of the eateries for lunch that accept the BuckID (included in your ticket!!) are within walking distance so you should not need to leave the campus for the entire day. If you chose to leave the parking garage you will be responsible for paying for the normal parking rates when you return. You can only use the pre-paid ticket once.
Sunday parking is not included, but you will only need to pay partial day rates (around $4).