It's invite only to top shareholders I assume and it's in the CBD at 2pm-4pm today.
They wan't confirmation if invitees will be attending by calling 08 9220 9830, So I think if you give them a call before you go they will probably give you all the details and let you in.
I'd like to go but can't make it as I still need my day job as SSN is a long way of letting me retire :)