Definitely Incon 1. I seem to remember a plethora of hotel towels and safety pins, and Simo in a dressing gown as the referee sprinkling salt all over the place to "purify" the ring. I think Al Johnson won despite not being convincingly lardy... Why the question?
As you know I've commissioned some fanzine articles. In response, one of my potential contributors asked me to remind him if I'd done anything noteworthy at Incon 2 or 5... and I wondered if the Sumo tournament qualified.
I recall being very disappointed with the towels and safety pins. I was the only contestant wearing a mawashi of traditional construction. And yes, Al knocked me out in the semi-finals and went on to win.