Hi! Welcome to NZ and Kiwi fandom 8) You should definitely attend CON 101 at 7pm on the Friday for an introduction to NZ conventions.
It's a couple of hundred people, with lots of panels - we should have the draft programme for this year up soon, but in the mean time the timetable from the previous Au Contraire should give you some idea of what to expect. We are planning more gaming than before; there's a dedicated space for casual board and card gaming, and we intend to run multiple RPGs and some LARPs. Is there anything you'd particularly like to see?
The majority of members wear normal-ish clothes, but wearing costumes throughout the convention is very welcome; there'll be spot prizes for the best dressed, and if you're into costuming, you should definitely enter the Masquerade.
We don't have a dance planned at this stage, but if people are keen, let us know - it can be arranged! Room parties are encouraged; if you want to host one, you'll need to book a Quality room in the party zone. Formal events are generally over by midnight, except filking (if that counts as formal), but as a hotel the venue is of course open 24 hours.
Selling stuff isn't the focus of the convention, but there will be stuff for sale at the Floating Market on Friday night, both new and used, and an Auction on the Saturday.