Kurnell's Top Gun regatta is also on the same weekend. I've also heard a rumour there's a regatta in the ACT that weekend as well.
What's wrong with everyone? From Oct through to Christmas is available, and all the regattas are on the same weekend.
I guess it's saves on greenhouse gas emissions to stop people travelling to regattas like this, but it would be nice to have a choice. Maybe the clubs are trying to keep the numbers down (I don't think).
I think Yachting Australia (and state authorities) should be more pro-active in helping to avoid this kind of thing.