I've tried looking for some and honestly I didn't find much.
- we already had gardening. The improved gardening system seems to only force me to rotate the plants out and make them produce fruit a lot faster.
- I've seen some sparse new interactions like "play in the rain"
- I've most definitely encountereed the annoying forced calendar events.
I feel like The Sims 2 and 3 provided better and less forced seasonal activities. Gardening made sence for The Sims 2 because we never seen it before. And festivals were the thing of The Sims 3's seasons, so is the thing for The Sims 4 seasons just forced events?
Also, god they're annoying! I don't want to cancel Christmas, but maybe not every year my sim will be in the mood to do literally everything on the list, including buying a fireplace to summon the Santa Claus!
The new thang that I do now is 100 baby challenge
in The Sims 3 (it's my first time!)!