A convention held in Denver, CO from 1977 to 1980. It was created as a training ground for the people running the 1981 Worldcon, Denvention Two.

Convention Date GoHs
Penulticon '77 November 18-20, 1977 Leigh Brackett, Fred Pohl, Bruce Pelz
Penulticon '79 May 25-28, 1979 C. J. Cherryh, Samuel R. Delany, Donald C Thompson, Maggie Thompson
Penulticon 3 February 22-24, 1980 Vonda McIntyre, Hal Clement, Marty Massoglia

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