Heya Andy,
While we're happy to bring whatever is required, it might be hard to organise as we really don't have much of an idea about how many are going to turn up.
It would probably be better in this instance for each person to just bring their own food. People could bring their own stuff for BBQ or cold dishes, vegemite sanga's, or whatever.
As I said though, happy either way. We have a good bakery nearby for instance, or cheap grass fed butcher.
We were however, thinking to just bring cold meat and salad to save the hassle of bbq'ing :)
Either way we're looking forward.
Cheers,
De'ana and Mark