The Sydney motor show hasn't always been on the same week in Oct/Nov as per the modern times, so they could well be correct.
I remember the '82/83 Motor show real well - it was Dec/Jan, and my brother & I were taken to it by a relative, while my parents were at the hospital - mum delivering my youngest brother. We also saw Aust vs England at the SCG during that time too - for a young fella who had only recently moved from the country to Sydney, going into the "city" (well, Moore Park area) was a huge thing - let alone twice within mere weeks (if not days) of each other.
If I could get over to my brother's place, he still has the promo sticker from that motor show on his toolbox - it has the dates on it.
Perhaps the 70s ones were also around a similar time? That would match up with your mate's memory - which seems pretty good (it's probably their wedding anniversary & his wife won't forget it!).
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