As everybody knows, ThunderCon was established by "ThunderChief" Larry Nemecek, antipodally in summer, to balance SoonerCon.
That is, ThunderCon, aka "Larry's media con," was a mass-sci-fi-media gathering, in contrast to SoonerCon's intents as a "litcon."
Above is the legal-sized flyer. Yeah, our guest was Ethan Phillips of Star Trek: Voyager and many other enterprises.
This here is our letter-sized flyer.
PS to see Ethan Phillips THIS year, come to Soonercon 33!
See ya in the ethereal beyond, fellow space cadets!