The latest PDS as some of you have already noticed states that a Classic Car like your GTR or GT has to be driven 10 or less times per month to qualify for insurance.
I went to NRMA this morning too, to get clarification of what the PDS means by "Drive Day". The PDS states that Classic Cars are not covered on "Track Days or Drive Days". I'm told that "Drive Days" include 'Cruises'. So just be warned that even if you tag along with a 'Cruise', nominally you are NOT actually participating if you want to remain insured with NRMA VVC on that day.