Dress up as either astronauts or scifi themed outfits, freeze dried foods, and then having a section of the party look like the moon for photo ops, hang planets and stars around, make moon rocks, lazer tag with guns that look like they're from a 1950's scifi show, and then I do have a device that launches people pretty high, and safety mats that could be fun for this. Making our own paper mache space ships or UFOs could be fun too. Perhaps I could even set up alien looking flora and fauna with context clues about them in the area that people could study, and have prizes for getting them right! Although, I may be the only one interested in such a thing.