Ad Astra 2004 was held April 2-4, 2004 at the Crown Plaza Don Valley Hotel in Toronto, ON. GoHs: C.J. Cherryh, Robert Charles Wilson, Don Bassingthwaite, Patrick Nielsen Hayden, Mark Askwith, Gord Rose. Chaired by Amanda Foubister.
Ad Astra XXII and XXIII were combined with Orion, a gaming convention.
Convention website: http://www.ad-astra.org/archives/Archive2004/
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