I too request that Saturday stay at 4pm. From my personal example, that's a 5:30am start for me, I need to get up at 4:30am for these events if I'm going to warm up. That's not THAT bad - well okay it sucks but I can get to bed early and get up in time for it - it's doable. However, a 3pm start means I'm getting up at 3:30 now, it's too late to stay up for it, and it's too early to get any kind of decent sleep before hand. It locks me out entirely, and I think it might be the same way for some other Australians and perhaps some Japanese.
I know there's more Europeans than others, but still, I've always thought 4pm was a decent compromise so that everyone (or at least most people around the world) can attend.