The Jingle Bell Run is the Arthritis Foundation's original festive holiday race, bringing runners, walkers, and strollers to the Navy Yard for a morning of holiday cheer. Participants deck themselves out in their best holiday gear and jingle bells for the 5K, with contests for jolliest jingler, best dog-and-owner costume, and most spirited team. Kids under 12 can join the Reindeer Dash, a free 50-yard fun run. The event village features ornament decorating, holiday games, a dog corner with treat...