If you have ever been stuck in traffic in Boston--specifically on (or because of) Storrow Drive, you may be interested in this bike ride on Sunday (21st) morning called HUb on Wheels. Storrow Drive is shut down and you ride your bike on it. It's ten miles on Storrow but there is a 30-mile and 50-mile option that takes you around the city but in such a way that there is reduced car traffic. (There's a link to the route map on the left-hand side of the page linked above.)
Registration is still open. At least it was as of last night when I signed up; and is only $50. (It';s $55 for same day registration on Sunday morning.) The money (you can give or fundraise more) goes to bringing more technology to the Boston Public Schools.