Minuteman Road Club

Go do the Wednesday night Charlie Baker Time Trial in Concord. They hold them every Wednesday night until around Labor Day.
http://nebc.us/
Good training time trial. You will need to buy a 1 day license, you do not need an MRC uniform. My guess on cost is $10 for the race, $10 for the 1 day license. Just a guess as I don't remember.

John R

Also the Pat Bell TT is every Tuesday at 6pm in Southborough. Cost is free, it is low key and self-timed. Riders go off at 30 second intervals. Its a decent 11 ish mile loop but there are 2 traffic lights on the course so it is not ideal.

http://www.patbelltt.org