The Crystal City spring 5k races are held every Friday in April, starting at 6:30 p.m. The 3.1-mile race begins and ends at 2121 Crystal Drive, and includes several water stations along a flat course in downtown Crystal City. Races cost $20 each, and registration is available on site race day or online. For more information visit: runpacers.com/race/crystal-run-5k-Fridays/.