Those who attended a two-day secondary school singing event in Rotorua earlier are being advised to get tested if they experience any Covid-19 symptoms.
A school choir from Avondale College attended the Big Sing gala, along with 11 other choirs from Auckland, Hamilton, Tauranga and Rotorua - a total of 350 students.
They came together on Monday and Tuesday for four sessions of adjudicated performance that were open to the public.
However, the final concert was cancelled just 45 minutes before it was meant to start on Tuesday night after the initial lockdown announcement.