baa half marathon Enter Plan Results Volunteer Watch Dana-Farber AWD Sponsors Sections volunteer at the b.a.a. half marathon B.A.A. volunteers support our races and transform each event with their enthusiastic efforts. volunteer at the b.a.a. half marathon Registration Volunteer Registration for the B.A.A. Half Marathon is closed. For more information on race day details, click here. Descriptions Learn about our B.A.A. Half Marathon volunteer opportunities. To see a full list of potential job descriptions, click here.