If you really want a space event, choose a space-style corporate party.
Let's start with Invitations. A person hands you an invitation to board a real spaceship. The departure will be at the exact time (the beginning of the party), the ship will take the path to an unexplored planet.
Immediately after departure, all problems are removed as if by hand, and they become grounded, unlike here in space... New horizons and distant galaxies are ahead!
The hall will be decorated with images of galaxies, stars, planets, asteroids, and comets. On the walls can be photos of heroes from "Star Wars", "The Fifth Element", fluorescent stickers, mirrored disco balls, a projector of the starry sky, a lot of foil in the decor. A photo zone with the image of cosmonauts or aliens will perfectly fit into the general interior.
Variations of costumes can be diverse: from aliens to astronauts and heroes of films about space.
The reception with drinks should also correspond to the chosen theme. And by design, color should be as unusual as possible.
Guests can expect a very active star program, with contests, space dances, Planet Parade, Quizzes, and the choice of the best Space costume. All this will be accompanied by space history, thematic films and prizes.