First Sunday in May every year Suzy Greenway (former pinup for Norton and president of Internation Norton Owners Association) opens her place just south of Stockbridge to anyone who can get there.
Hundreds of bikes (which is a lot for Michigan) and it takes me about 3 hours to get there. I start in Royal Oak, work my way through Wixom, then Ann Arbor picking up riding buddies. Send me an e-mail if you want more info. cbibbs AT home DOT com