Wikipedia
Minicon
Minicon is a science fiction and fantasy convention in Minneapolis usually held on Easter weekend. Started in 1968 and running approximately annually since then, it is one of the oldest science fiction conventions in the midwest United States. It is run by the Minnesota Science Fiction Society, a non-profit organization that is "dedicated to furthering the appreciation of science fiction and fantasy literature".
Minicon has had many guests of honor over the years, including Gordon R. Dickson, Poul Anderson, Clifford D. Simak, Lester del Rey, Frederik Pohl, Octavia E. Butler, Harlan Ellison, Larry Niven, and Terry Pratchett.