No More Street circuits after 1966, Dunedin 1968-9 circuit query

[jellywrestler]

ANZCC, now motorsport new zealand put the stops on street circuits in 1966 I understand yet in 1968 and 1969 there was combined street circuit with carts bikes and cars on the wharf.
I know classic Racing came along and the likes of Waimate, Dunedin and others ran street circuits, but how did these two meetings in Dunedin come about folks?

sorted now, the 1968 and 69 meetings have cars bikes and karts on the cover, the latter two ran laps, the cars were drag races so there was no circuit racing there.