Ozarkon was run by the Ozark Science Fiction Association (the same group of fans who ran the successful St. Louis in '69 Worldcon bid.) from 1966 to 1972.

It seems to have been done in by the disastrous Ozarkon 7.

Convention Date GoHs
Ozarkon 1 July 29-31, 1966 Ted White
Ozarkon 2 July 28-30, 1967 Roger Zelazny
Ozarkon 3 July 26-28, 1968 Harlan Ellison
Ozarkon 4 1969
Ozarkon 5 1970
Ozarkon 6 1971
Ozarkon 7 July 28-30, 1972 Larry Niven
Ozarkon 7 1/2 1972
Wikipedia Fanac File770 Ansible
Concatenation Fanlore Files https://duckduckgo.com/?t=lm&ia=web&q={$name} (IA) Website . 1966 1972

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