Space birthdays

I discovered this site via a friend's blog and it appeals to the geeky side of my nature. I seem to have very recently celebrated a significant birthday on Mercury (140 – I think I look quite good for my age!) and have another milestone birthday coming up on Mars - my 18th - on 16th March. Which rather conveniently happens to fall on a Saturday. Would it really be very geeky of me to have an 18th Martian birthday party and invite my friends to come dressed up as aliens? I'm sure I could find an alien costume for Jessica...