Default holidays

You have to create Spooky day on your own. Since the spooky stuff pack is required for it. Original major holidays are :
Love day
Harvest fest
Winter fest
New Year’s Day
the one with the flower bunny during spring I forget the name
There are more holidays but they randomized through out the calendar

If you create a new save you can see the default holidays in that save.

"Atreya33;c-18215875" wrote:
If you create a new save you can see the default holidays in that save.

I was just going to suggest that. ^

The default holidays that show up in every new file are Harvestfest, Winterfest, New Year's Eve, and Love Day.

I always add in "Leisure Day" like from sims 3 seasons, in the summer. I also add in Spooky Day and a flower bunny/easter type day. And i add winterfest eve the night before winterfest.

I hope I'm not missing any but I think it is just the 4 defaults

Did you check out Carl's Guide to see what they show?
https://www.carls-sims-4-guide.com/expansionpacks/seasons/

The bunny holiday is not by default. I've never had it in my game. I don't really want to do Easter without actual religious gameplay.
Spooky day I tend to create; it is not by default either.