|Science Fiction Convention|
|Focus:||science fiction and fantasy|
|Founder:||Micheal Fobbs and Terry Riley|
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Concentric 83 was held on Nov 18-20, 1983 at the Holiday In West in Columbia, MO. Guests included Jack Chalker, Glen Cook and Robert Chilson. Fan Guest was Pat Killough.
Concentric 84 was held Nov 2-4, 1984 at the Tiger Inn in Columbia, MO. Guests included Paul Williams and Robert Chilson.