Sunday, Sept. 13, 1:00-4:00 p.m. Meet at City Hall. Co-Sponsored by Historic Preservation Commission, the Somerville Bike Committee and Groundwork Somerville.Ride escorted by Somerville Police. Designed for all ages and riding levels.$3 Donation Appreciated. A few rest stops, then concluding with light refreshments at Aeronaut Brewery at 4:00 p.m.