These votes are organised by the current NatCon committee in liaison with the Science Fiction and Fantasy Association of New Zealand.
In the early years of the national convention, the four main cities (Auckland, Wellington, Christchurch, and Dunedin) all held the NatCon, but in recent years, the conventions have mostly been held in one of the two largest cities, Wellington and Auckland, both in the North Island.
One reason for this was an assumption that many New Zealanders would instead attend Aussiecon II, the 1985 Worldcon, in Melbourne, Australia.
A few months after Norcon II, a group of Auckland fans decided to stage Orcon at Easter in 1985 and their publicity called it the seventh national convention.
It is mostly made up of comic, toy, video game and DVD stalls, run by local businesses.