B.A.A. 5K Registration Participants Results Volunteer Train Special Olympics MA Sponsors Sections volunteer during marathon weekend volunteer during marathon weekend B.A.A. VOLUNTEERS TAKE PRIDE IN THEIR ROLE WITHIN OUR RACES AND WE ARE GRATEFUL FOR THEIR COMMITMENT AND SUPPORT. Registration Volunteer in the heart of the city on Marathon Weekend! Volunteer registration is now closed. Descriptions Learn about our B.A.A. 5K volunteer opportunities. To see a full list of potential job descriptions, click here.