I always ask for two tables whenever I'm asked to participate in the local Middle School display of different professions in the Springtime. (It has a different name, but I forget) It exposes those kids to a variety of jobs they could think about. We always try to make it fun for them.
I have a video running that answers all the questions their teachers have printed out and they have to answer about my profession. (I ask for the list ahead of time)
I have a three foot model of the Wright Brother's Flyer alongside my books about them plus some of the awards those books have been given. I have copies of my books. I have examples of editor's notes on manuscripts. Plus I have a galley sheet from a picture book that shows how they are printed. Plus some folded and gathered samples. (F&Gs)
It's a madhouse of classes flowing in and out , talking to them, and answering questions.