[Suicide Junkie]

It could be as simple as "email the GM with your game password if you think you qualify for the immunity this year!"

Some possibilities:
- Person with the most expensive ship in space.
- Planet with the minerals production closest to 5,000 without going over.
- Planet with the highest organics value.
- Person who has collected a sample of everyone else's race.
- Representative combat - Create a gladiator design (and strategy!), and the GM will run a free-for-all combat simulation with all the ships at once. Whoever's ship survives wins.