I offer this as a template for your own unique mailer. I suggest you keep it interesting and let them know how many helpers you will need. Just do your best to make it enjoyable to all and easy on you.
Helpers are a wonderful thing to have.
They handle their stations and you only oversee the helpers. Otherwise, you play the audience and entertain them with your knowledge. I have all new, high resolution images printed on photo quality paper, awesome 15 inch laptop computer with sideshows, and lots of equipment I would like to display. Also, I will have an interactive area setup for hands on projects. I am very excited about this project because I have such great material and visuals to entertain and amaze the students.