My thoughts on the photo posted by Ken H
The way the cars are lined up looks like the Dummy Grid at Levin.
In the list of entrants at the January 1964 Levin meeting Ken Smith is listed as driving the Lola number 20. His father Morrie is also listed as driving the car with the number 120.
Strangely neither Ken or Morrie are listed in any of the races in the programme but there is a race with the Massarari (H. Crawford), an MGA number 31 (R.Grace) and an Austin Healey 2400 (G. [Grady] Thomson) which could fit in with the photo.