If it’s not raining, probably a barbecue in my sister’s backyard. Being summer kinda dictates. There is a mix of Northern Hemisphere tradition (Christmas pudding, cake etc) and Southern Hemisphere practicality (T-shirts, barbecues, salads, and cold beer).
Depends on the weather though. For some reason Sydney on Christmas Day is usually either underwater or on fire.
You mean like making Pillsbury cinnamon rolls from an exploding can and watching Charlton Heston movies all day?
Nope.
Tabby
-Nothing says Christmas like Planet of the Apes.
Oh dear - are we related? This year was the first year we’ve done this because two of our grown daughters had their first children this year and this was a morphing compromise on tradition so that they could get home to spend Christmas with their own husbands and babies. BUT, we served beignets and then an early scrumptious spaghetti/lasagna lunch before everyone hit the road home. Hope my sons in law (or is it son in laws?) don’t feel the same way you do 
With my sibs living all over the place with family obligations of their own, we have evolved a tradition that has become firmly established in my son’s head as “Second Christmas.”
Some time after Christmas, often around New Year Day, but not necessarly, my siblings and I congregate for our own Christmas. Next week, I’ll be baking some of my mother’s beloved Christmas cookie recipies for our celebration sometime next weekend.
Except for the time when one of my sisters lived overseas and could not be around for Christmas, I would never have chosen to ship a box that could be openend on Christmas Day if delaying X amount of time meant that I could have the enjoyment of watching my dear sibs open my gifts.
Christmas in mid-January? Sure.
Sons-in-law.
(Hey, it’s 01:00, and it’s just zinfandel, cigarettes, Shubert on the classical station, and me, so I though’t I’d make myself useful.)
We wanted try a more traditional “Winter Solstice” Druidic type holiday this year ,but apparently you need a permit or somesuch off of the local council to practice human sacrifice and we’d left it to late to put our application in.
But we’re eagerly awaiting next years festival.