I probably will do it. I did this ride a couple of years ago, and it was fun. Very nice t-shirt, except we didn't have anywhere to put it during the ride so they said no problem, just pick it up at the end of the ride. At the end of the ride the t-shirts were gone. Lesson learned.
This is not a ride for a skinny-tired road bike. The cobblestones were very rough! It was fun riding out to Fort McHenry.