The D.C. Armory is an armory and a 10,000-seat multi-purpose arena located in Washington, D.C. managed by the Washington Convention and Sports Authority. The Armory was constructed and opened in 1941, as the headquarters, armory, and training facility for the District of Columbia National Guard. In recent years it has also become a venue for a broad range of events. The Armory's Drill Field is approximately 80,000 square feet (7,400 m2) and has hosted trade shows, concerts, warehouse sales, the Washington Auto Show, sporting events, and Presidential inauguration balls.