When I was a kid it was stockings (sacks) of small stuff left on the end of the bed first thing in the morning, then breakfast, then waiting until everybody was absolutely ready before going into the lounge (which you weren’t allowed to even open the door to up to that point) and opening the big stuff. Late lunch (crackers only pulled between lunch and pudding), games, tea, tv, bed.
The only odd thing my parents did was to convince me that it was perfectly normal to close all the doors on the advent calendar and re-use it the following year. I was about 25 before I found out that everybody else just buys new ones.
Edit: forgot about the sherry. Me and my sister were allowed a small sherry on Christmas morning from the age of about 7. That’s probably not normal either.