Many schools still have some kind of Halloween party for the classroom. Room mothers can vary on what they plan and prepare. If you're stuck and it's all on you, I thought the first idea-the container-might be a nice activity to do with your students during your party.
If you're looking for more fun ideas or a special lesson, check out what the teacher authors from TpT have up their sleeve to help you through the next week. Don't forget to look out for a free treat or two.