Oh boy...that goes back to the first year we attended!....I recall the bike and the names etc as I was building a semi-custom Triumph 650 of my own at the time...My dad, who was big into slideshows, had tons of pics...they all still exist but they are, I think, in my older brother's possession. He is probably not any time soon in a position where he will be "un-busy" enough to go looking.
Maybe hang on to my info here and drop me a note ....I will see about somehow finding the pictures as there was a lot (a few hundred anyway) of pics from 1970 to 1973