Mother's Day in the US was originally conceived as a pacifist holiday for mothers to organize for disarmament.

Mothers' Day: 1870

Fathers' Day: 1972

Every holiday is made up.

Indeed. Even Christmas was controversial in early America because it was seen as a chiefly Catholic holiday that represented excess, decadence, and gluttony. Now it's the cornerstone of the entire retail industry.

And still represents excess, decadence, and gluttony.

You say that like its a bad thing. :-)

Eh, Christmas is basically just hijacked Winter Solstice. I would say that of all the holidays, the ones triggered by Astronomical events make the most sense since seasons have (or certainly had) very real importance to the cultures that celebrated them.

That is not to defend the actual traditions of Christmas though.

Summer/Winter Solstice?

Well, Australia Day isn't a made-up holiday -it's always been the 'National Day' (think 4th July). But it's just that the Meat + Livestock Board spotted a gap in the 'traditions' market and filled that gap in with some shrewd marketing.

Really? I've never really associated Australia Day with eating meat, but if we were going to organise something on that day a barbecue would be quite likely. But that's probably true of any day where we'd be organising a family gathering. It's certainly not like Christmas where you have to pre-order a turkey.

I do find it ironic though how barbecues are considered to be an Australian tradition. But then the most well known brand for barbecues, Weber is American.