Planet cut outs. Key Concepts include: Position of the Earth in the solar system Print the worksheet on card stock, cut out, and have the students put the planets in order. Students could also number the planets to demonstrate order.
If you are inviting kids. I like these ideas: -A kid drink for the toast (like cookies and milk) -Activity sheets/placemats/crayons -Legos/playdoh -Hire "babysitter" like a 13 yr old cousin -Kids open candy/snack bar