Capital One Arena to Host Fans at 10% Capacity; Nats Park and Audi Field up to 25% Effective immediately, Washington D.C. has approved increased capacity limits for Capital One Arena, Nationals Park, and Audi Field. The Monumental Sports & Entertainment’s waiver was approved Friday granting D.C. sports venues the opportunity to welcome fans at a reduced capacity. Capital One Arena — home of the Washington Wizards and Washington Capitals — will open at 10 percent capacity, hosting around 2,100 fans. Nationals Park will be allowed to operate at 25 percent capacity — around 10,000 fans — an increase from the 5,000 fans that were allowed to attend opening day.