There are a few rooms left at the Eagle Crest at the regular rate ($139/night non-refundable pay now or $149/night refundable pay when you check out). If you're interested in doing this, even if it's just for one night, you should do it now.
We will have the overflow hotel information listed tomorrow. It will likely be the Courtyard Marriott in Ann Arbor, which is an awesome location, freshly renovated and the little sister to the Eagle Crest.
If you just want to come walk through the parking lot on Sunday to see the Show & Shine, you do not need to register. If you want to participate in any other activities including the tech sessions, meals, pizza party and go karting, or anything else, you will need to register.