Welcome to Christchurch! Pentax isn't the most common gear here, but you're not alone.
If you're interested in meeting other photographers, I highly (if not objectively) recommend checking out The Rangiora Photographic Society (
Rangiora Photographic Society ? Embracing the Light). There are a number of other clubs in and around Christchurch which may be more convenient for you, but I haven't visited them.
As you're French, you'll want to check out the Lyttelton Farmers Market; I'll be the one selling my wife's wonderful goat cheese.