Travel to Another Planet
Let your kids decide where they want to go in the solar system, and then create an advertising campaign for it.
Storytelling
Seasonal Themes for Combining Younger and Older Grades
Put an older student with a younger one, in this self-esteem building exercise. Using a Thanksgiving theme, like “Write a story from the turkey’s point of view”, have the younger student tell the story, with the older writing it down.