In 2009, the B.A.A. added a thrilling set of races to the Sunday before Marathon Monday. Not only did the B.A.A. 5K present a chance for thousands of runners of shorter distances the chance to cross the famous Boston Marathon finish line, but the B.A.A. Invitational Mile presented a spectator-friendly set of track-meet style races that brought the cheers to Boylston Street a day early.

In 2010, the B.A.A. added middle school participation to the event line up, where sixth to eight graders race on a 1,000 meter course around the urban block.