What a wonderful place to dance! When: Social Ballroom Dance every 1st Saturday of the month; other dance styles (tango, West Coast swing, lindy, and mixed ballroom) throughout the month. Most dances are preceded by a lesson. Where: The historic Schoolhouse at 10201 Colvin Run Road, Great Falls VA 22066, now called the Colvin Run Dance Hall. Dancers have been laughing and twirling across its 1200 sq ft, sprung oak floor for 81 years.