Not yet mentioned (that I noticed) was the time of year. My recollection (I was very much on the periphery of the 1968 one) is that the first two ('67 & 68) were on the Queen's Birthday long weekend in June but they moved to Australia Day, another long weekend until Nick Greiner forced Sydney Day strictly to the 26th January. This lasted until just after the 1972 Nation in Canberra. The Aquarius Festival of that year was held over Easter and also used the Yarralumla Woolshed to great effect so from then on the Nationals were held over the Easter (four day, outside Victoria) weekend; the first of these was at Melbourne Uni. They were peripatetic around the country until 1992, when they became sessile at Canberra.

Cheers, Rowan