As already flagged in a couple of comments at the earlier planting on the New Zealand election (thanks, Errol), there is now some discussion of a delay in the polling date. The dissolution of parliament did not take place Monday as had been expected. This does not immediately mean the election date, 19 September, has to be pushed back. But it means it is possible.
This uncertainty is due to the recent return of COVID-19 cases to the country, and all the complications that could cause for holding the election. There are provisions of the election law, added rather recently, that would permit delay under specified conditions even after a dissolution.