I found out too late about the Pre-Boston Marathon Bike Ride, organized on Facebook.
It was Sunday, at midnight, silly hats encouraged. Next year I'm definitely there.
If I can't ride all night, maybe I'll join the 5:45 AM group.
Another AP article I found before, but not now, reported that some people make it an out-and-back for 50+ miles. That could be fun and save me the $6 train fare.
Next year, definitely.