I'd be very surprised to see Rally NZ happen unfortunately. Currently we have a mandatory 14 day quarantine in place for new arrivals. Lockdown restrictions are slowly being reduced, but somehow I can't see how a huge travelling circus would be allowed to enter the country even as far away as September. I hope to be proven wrong.
Not sure if the 2021 calendar has been finalised but it would be great to see Rally NZ on it especially if this years event will probably be cancelled.