The calendar is the easiest teacher a family has. It arrives on its own, it repeats, and each moment comes with something a child can make that the table then uses.
The thing that works at Rosh Hashanah works at Sukkot and at Passover: the child makes an object, and the object is then used by everyone. A cover, a decoration, a place card, a plate label.
It is not a craft to fill an afternoon. It is a job, and it is why a three-year-old who made the thing will sit at the table looking at it.
Decorations that survive a week outdoors.
Eight nights is long. How to pace it.
The noise is the best and hardest part.