The official Harley-Davidson 105th Anniversary dates are  August 28th-31th. And as you can imagine, not many hotel rooms are still available.  A business relation at Biker City Guide had sold more than 450 rooms and still has 50 available within 10 miles from downtown.  So, if you go there in August, I would recommend that you rush your hotel reservation. You can call on my behalf Cindy Erato at 262-821-6691 or 414-659-3318, or book online at Biker City Guide Lodging.