I think you’ll have trouble getting 80 players for a 2-day 1930s game that was written by someone that NZ players don’t know.
We don’t have a culture of multi-day one-off games here yet. Most 2-day games in Auckland are part of campaigns, and I think people commit a whole weekend to playing partly because they’ll be able to play their character again, or at least play in the setting again. It’s a kind of investment.
1930s is only a moderately popular genre here. It’s easiest to attract large crowds to fantasy games, followed by horror.
80 players is a very large game here. Sure, Chimera and Teonn get well over 100 people but they are the exceptions, and they have built up to it (Teonn built on the fan base of other fantasy campaigns run here).
There’s also the excitement factor. Large number of players like that only come to games with lots of buzz and excitement. The thing that generates the most excitement is when original games or events from organisers with a good local track record are run, and they’re preceded by exciting pregame material.
If you’re keen to run a one-off larp here, I’d recommend running one that goes for 3-4 hours or so on an evening, with 10-30 characters or so. That’s more the format that attracts players to pregen larps here, and the size of game that’s more achievable. It helps if it’s your own game, and people have gotten a feel for who you are - but those aren’t absolute requirements, especially if the game info seems appealing.
EDIT: Not wanting to seem negative or anything, I just wouldn’t want you to spend a lot of time translating and organising only to find out what I’ve said the hard way.