Keefe Tech in Framingham is offering a Bike Maintanence WS in April -

Spring Bicycle Maintenance
SP-06 • Class held: Apr 6 • 3 Hours (1 Session) • Tue: 6:30-9:30
It's time to clean up that bike and get it tuned up for the coming season. This class is for all bike owners - even those who say, "I don't even know if the thing still works." Designed to take the intimidation out of bike maintenance, you will learn the basics of bike fitting, operational adjustments, common repairs, regular maintenance and safety checks. You will get answers to all your questions, from "Why all the gears?" to "Where can I get the best tires for me?" The more you know about how your bike works, the more confidence you will have in riding it.
http://ktconed.org/sports.htm

Cost is $34 a friend took it last year and recommended it. I was thinking about signing up myself.