Runners wishing to race their neighbors can sign up for the 2.7-mile Walter V. Moynihan Town Day Road Race, to be held on Sept. 21 at 8:30 a.m. as part of the annual community celebration. Organizers will award trophies to the top male and female finishers in multiple age groups. The race will start at Arlington High School on Massachusetts Avenue, and will travel various roads and the Minuteman Bikeway before finishing in front of the school. The registration fee is $20; proceeds will go toward Arlington youth activities. Runners can register at the high school before 8 a.m. on race day, or sign up in advance using a form online at www.arlingtonma.gov/recreation.