Registration is open for the Phoenix Derby, a cyclo-cross Garage Race and Fundraiser, May 17, 2014, 2:00-6:00 p.m. The whole family is invited to participate in races, including a speed race, team relay, courier-inspired obstacle challenge and kids' race (ages 15 and under). To sign up, go to http://phoenixderby.kintera.org/home. Registration fees vary per race; admission is free for spectators. The event is a fundraiser for Phoenix Bikes, an Arlington nonprofit that helps youth develop skills and education through bike repair, mechanics and sales. The Crystal City Business Improvement District and Vornado/Charles E. Smith are also event partners.