Historically, Canterbury and Otago/Southland racing districts had stakeholders and horses in sufficient numbers to be able to stand alone, mostly.
But more recently, it is obvious that that was no longer the case, and there was a tacit agreement not to race against the other district's premier or important meeting. So, once Cup meeting was over, there was a modest Coast circuit ( offered a welcome break from the heat and dust and tough competition) and a few other smaller meetings in both districts leading up to Boxing Day at Dunedin/Timaru Cup in Canterbury. Then Invercargill had its day in the sun, followed by another Coast circuit for Canterbury along with Omakau/Cromwell for the southerners.
Things have been fiddled around with since and dates altered - but the arrangement did work well.
Wellington was a target after the Dunedin/Invercargill options, for the classier southern horses, coming as it did, then, right after the second Coast circuit in early/mid Jan and at times clashing.
At least there wasn't the situation seen up north with the change in the Auckland Cup meeting as well.as the Karaka meeting pulling the Wellington Cup meeting to pieces -ruining the Trentham Stakes and other races into the bargain.
A premier meeting at Riccarton was never considered, between Cup and the Midsummer meeting late January, too many folk away on holiday and too much racing all over the place to make it work.
There have been mutterings from a few trainers who don't want to travel away, but the summer racing pattern did work well.
There were even two- and three- year old races over the period. Fancy that.