The New Zealand National SF & F Convention for 2017 will be LexiCon. The vote to award the national convention to LexiCon was taken at the 2015 National Convention.
Note that the 2016 National SF & F Convention is Au Contraire 2016 which will be held at Queens Birthday weekend 3-5 June, 2016, at the CQ Hotel in Cuba Street, Wellington.
You may receive updates for both these conventions by registering at their web sites. If you have a registration from a previous Au Contraire convention, you may use that to register for updates.