From ArborWiki

Annual downtown Ann Arbor auto show, with about 400 cars displayed on the street. Sponsored by the Main Street Area Association. The show first started in 1994 and has grown immensely since then. Recently, automakers like Ford and have begun to get involved with the show. At the 2008 Rolling Sculpture Car Show, Ford brought three of its concept cars and Nissan brought the all new GT-R.

2008 event details, for the 11 July 2008 event: http://www.mainstreetannarbor.org/newsdetail.asp?id=20