- February 20-21, 2008, Orlando, Florida
- September 17-18, 2007, Los Angeles, California
- June 26, 2007, Richmond, Virginia
- March 23, 2007, St. Louis, Missouri
- December 13-14, 2006, Tucson, Arizona
- September 20, 2006, Richmond, Virginia
- June 29-30, 2006, Atlanta, Georgia
- March 22-23, 2006, Long Beach, California
- November 17-18, 2005, Reston, Virginia
- June 23-24, 2005 St. Louis, Missouri
- November 18-19, 2004, Reston, Virginia
- June 24-25, 2004, Minneapolis, Minnesota
- November 20-21, 2003, Richmond, Virginia
- June 26-27, 2003, Scottsdale, Arizona
- November 14-15, 2002, Alexandria, Virginia
- June 27-28, 2002, Orlando, Florida
- November 15-16, 2001, Alexandria, Virginia
- June 28-29, 2001, San Diego, California
- November 16-17, 2000, Washington, DC
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