I am chair of a nice little event called Badger Burrow that will be running out of Madison (Middleton) WI on May 21.
This is a TSD format event on paved roads. Speeds are brisk and the roads are all in the driftless area where the glaciers missed. This means tight twisty roads over ridges and through narrow canyons. We have long transit stretches where you can enjoy the scenery, followed by 3-5 mile "stages" where you need to maintain an average speed, usually around 40-45 mph.
Almost forgot, you can find more information at msreg dot com/BBRally2017
and for some focus content, here we are running a national event in Minnesota last January