Wedding at Christmas

Weirdest thing happened today.
I'm at home in New Zealand with my wife and kids, staying at my parents place. It's xmas day. The phone rang at 8am. My brother. He's getting married today. At my parents place. That's what he told my Mum.

It's now 230pm and in an hour a bunch of folk are turning up for the wedding. The weird thing is that my parents only needed a few hours notice to host it. The shops are all closed and they had everything they need. Flowers have been picked and arranged. Food has been cooked. Clothing prepared. Dad's even had a shave.

I think this might be a New Zealand thing. I got married with 3 weeks' notice due to visa issues.
So a wedding is happening in 90 minutes time and we are all ready to go. I suspect that it would have been much more effort to organise if my brother had given weeks or months' of warning.
We are assuming he's marrying his girlfriend of 15 years. He never said.