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When your character opens their grab bag, they will find:

Fireball Jellies: A jar of red jelly candies that are actually fire pellets. If you eat one, it will burst into flames in your mouth. If you drop the jar, all of them will detonate at once. There is a warning label on the jar explaining that they explode, so it's really on you if you eat it.

Plumbob: For the next week, a crystal appears over your characters head that indicates the mood of your character based on colors.

Powerful Bite: You now have an incredibly powerful bite

As for Advent Calendars:

You received a Cheese Calendar! You receive a different kind of cheese each day.

And

You received a Playset Calendar! In theory it will make an entire toy playset fit for model trains, but it's 90% plastic trees