Concave 2.5
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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 in Park City, KY as a venue for Concave Three. It was chaired by Pat Molloy.
| Concave 2 | Concave | Concave Three |
| 1981 |
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