Hey Dorian, great to hear from you. It would be awesome to see more of a larp community growing in Palmerston North.
There are at least a couple of NZLARPS members there already, and the society is on a mission at the moment to grow regional larp - see this post.
We've found that forming a core hub of people to run a variety of game styles and advertising them widely are good ways to get started, because long-lived communities are more likely to form around people running various games. Single larp campaigns or chronicles are great, but the community around them often disperses when they end. Also, a lot of people enjoy having various different play styles available to try out.
You're also not that far from the Wellington scene, which is growing really quickly using that strategy. They have at least a couple of campaigns with weekend-long games, and a lot of one-off larps running.
If you do Facebook, there's a fairly large NZ larp group (500+ members) here: facebook.com/groups/nzlarps/