Brentsville Stop (Sept. 24, 11 a.m. to 4 p.m.) – Learn about farm life in Prince William County during the mid-1800s. Tour the 1850s farmhouse and learn about how Prince William Farmers and slaves lived and worked. The event at the Brentsville Historic Center at the Brentsville Courthouse Historic Centre, at 12229 Bristow Road in Bristow, is free.