This two-day event, held annually during Memorial Day weekend, is located in Reston, Va., in the beautiful Lake Audubon. 2010 marks the 23rd year of the event, which includes an open water clinic, a 1-mile practice swim, and two competitive races, which are 1 and 2 miles, respectively. In 2010, it joined the H2Open series, a national open water series developed and managed by U.S. Masters Swimming.