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Concave 2.5 (which was also Halfacon '81) was an "Octocon-like mini-relaxacon" held December 4-6, 1981 to test out the Park Mammoth Resort (near Bowing Green, Kentucky) as a venue for Concave Three.
|Concave 2||Concave||Concave Three|
|This is a convention page. Please extend it by adding information about the convention, including dates, GoHs, convention chairman, locale, sponsoring organization, external links to convention pages, awards given, the program, notable events, anecdotes, pictures, scans of publications, pictures of T-shirts, con reports, etc.|