Minicon 22 was held 17–19 April 1987 at the Radisson Hotel South (Bloomington). Guests of honor were David Brin (pro), Fred Haskell (fan), Erin McKee (artist), and Jerry Stearns (music). Robert Bloch was toastmaster. Diane Duane, Jane Yolen, and Ellen Kushner were honored guests. The executive committee was David Dyer-Bennet, Joel Halpern, Scott Imes, Gin Nelson, and Martin Schafer.
The membership numbered about 1950. This according to "RUN! IT'S GROWING!", "An Apazine for Minneapa on the subjects of Minicon and Minn-stf by Don Bailey", which says "approximately 1950 people attended Minicon, an increase of over 400 people over 1986. We don't know why there was such an increase but it happened."
Here is a PDF of the whole book (24 MB).
Scans are available here in two qualities and file sizes. The first column has the raw scans. Most people want the second column, in which the files have been substantially cleaned up to remove the grain of the paper, bleed through from adjacent pages, etc. The PDF above was generated from the second column.
Most of the Minicon 22 program book is in the public domain due to having been published between 1978 and March 1989 without a copyright notice nor subsequent copyright registration.
Art by Donna Barr and Erin McKee in the The Minicon 22 Program Book is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License.
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Here's a video including images of some of the button badges used in this Minicon era.
Here's the t-shirt, front and back, respectively:
Here is Teddy Harvia's cartoon con report.