For a really long ride, go here:
http://www.teamstrange.com/2010/mn1k
The annual Slimey Crud Run cannot be missed:
http://www.slimeycrudrun.com/
The focus of Walt Ride 2010: Antique bike racing at Road America:
http://ahrma.org/
Antique Motorcycle Club of America; Viking Chapter Meet in St. Paul. But it's the same weekend as Walt Ride:
http://www.vikingmc.org/
The Bearded Lady Motorcycle Freak Show in Minneapolis:
http://www.beardedladymotorcycleshow.com/
This is just for starters.... have fun.