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  2023 August 12, 2023 at the Walter E. Washington Convention Center

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  2022 September 3, 2022 at the Walter E. Washington Convention Center

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  2021 September 17-26, 2021 online

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  2020 September 25-27, 2020 online

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  2019 August 31, 2019 at the Walter E. Washington Convention Center

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  2018 September 1, 2018 at the Walter E. Washington Convention Center

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  2017 September 2, 2017 at the Walter E. Washington Convention Center

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  2016 September 24, 2016 at the Walter E. Washington Convention Center

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  2015 September 5, 2015 at the Walter E. Washington Convention Center

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  2014 August 20, 2014 at the Walter E. Washington Convention Center

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  2013 September 21-22, 2013 on the National Mall

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  2012 September 23, 2012 on the National Mall

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  2011 September 24, 2011 on the National Mall

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  2010 September 25, 2010 on the National Mall

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  2009 September 26, 2009 on the National Mall

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  2008 September 27, 2008 on the National Mall

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  2007 September 29, 2007 on the National Mall

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  2006 September 30, 2006 on the National Mall

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  2005 September 24, 2005 on the National Mall

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  2004 October 9, 2004 on the National Mall

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  2003 October 4, 2003 on the National Mall

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  2002 October 12, 2002 on the National Mall

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  2001 September 8, 2001 at the Library of Congress