December 12th is the Santa Speedo Run. This is a fun event to watch (if not fun to partake) in Boston for 10 years. The race sells out each year (they have a 500 runner limit) and each year the run raises money for local charities; this year the recipients will be Crossroads for Kids and Bottom Line. The race is in good fun in the heart of the BackBay extending slightly more than 1 mile.
The race gets a fair amount of coverage by local news stations as one might imagine. I've included a brief clip from NESN's coverage of the 2008 run below and if you would like to see more, visit The Boston Globe 2008 Santa Speedo Run photographs by linking here.