Date / City
May 14-17, 2001 Washington, D.C.
May 13-16, 2002 Washington, D.C.
May 12-15, 2003 Chicago, Ill.
May 17-20, 2004 Washington, D.C.
May 16-19, 2005 Washington, D.C.
May 15-18, 2006 Washington, D.C.
May 14-17, 2007 Seattle, Wash.
May 12-15, 2008 Washington, D.C.