It's a 2 day affair, bike from the Quad Cities to Dubuque on Saturday, stay at a dorm room there and ride back a different route on Sunday. A shorter option starts and ends in Preston, IA.
I did it last year and shared pace line work with three very pleasant Chicago triathletes on the way up and suffered solo on the ride back into a southern headwind, including the century loop option.
It's a nice ride. Just hope I get myself back into shape before then....