Yeah, I am wondering about that too. I think that the Conondale event just had an enduro class, and I was always a trailrider/enduro fan, not MX, so I think I just took pics of the enduro bikes cos it was unusual to see them racing. The Miriamvale event was more of a club day type thing.
By the way, this batch are over-sharpened. Next lot I'll wind that back a bit so they aren't so ummm... weird.