If you are into racing, Road America, Chilton and Beaver Dam are all fairly close to Sheboygan, and probably have events going on that weekend. You will be near the Kettle Moraine, which is pretty good riding. Search out the Holy Hill area, it's a blast. You might PM 11Ohio, he lives in Milwaukee and can ride most any time. My wife is having surgery on Friday, otherwise I would ride up for a bit. WIsixfitty lives up that way, and rides through the Nicolet National forest regularly. You might give him a jingle as well.
Man. Now I wish I could go!