Cricket at the 'G on the 26th, a million people on Sydney Harbour on the 31st, and the Southern Alps three hours east of both. Two fixed dates and a whole summer to build around them. Tell me when and I'll shape it.

The Boxing Day Test starts at the MCG on 26 December, every year, without exception. Day 1 is the one people fly for - 90,000-odd in for the first session, and a city that shuts down around it. Get that date locked and the rest of the trip arranges itself.
The two big dates are fixed, and everything around them books out early - flights from India for late December go months ahead. Come in February or March instead for the same weather at a much better price.
Melbourne stops. Day 1 at the MCG is the ticket to get.
9pm family fireworks, then midnight over the Bridge.
Hottest, longest days - and the priciest fares of the year.
Still summer, minus the crowds. Best value of the season.
Both are online applications, and both are slow - New Zealand especially. We prep the paperwork, check every document and submit for you, so the processing clock starts as early as it can.