In Catholic elementary school, we did an Advent thing every year. They were fun.
We also did caroling, and putting on Christmas plays at the local retirement home.

I don't have any helpful suggestions. My artistic ability peaked with Thanksgiving hand-turkeys in second grade. 😕

Edit: maybe this site will help, it has some calendar suggestions about halfway down the page.
https://www.100daysofrealfood.com/advent-calendar-ideas/

In Catholic elementary school, we did an Advent thing every year. They were fun.
We also did caroling, and putting on Christmas plays at the local retirement home.

I don't have any helpful suggestions. My artistic ability peaked with Thanksgiving hand-turkeys in second grade. 😕