I'm surprised this hasn't been done at a Webmaster event before. Dropping 60 grand or so on your top 20 affiliates or as a promotion for the chance to do something most people will never experience instead of hosting yet another drunken free for all party will get you a lotta exposure.
As a Space nerd, I've been itching to do it since I heard about it a year or two ago. The plane was in Vegas this week actually. If you get enough people, you can charter it from Phoenix, Vegas or wherever instead of having to travel to Florida.
The price is quite reasonable for what you are doing as heading into the wild blue yonder ain't cheap...
Flight in fighter jet ~$1000
Zero G ~$3000
Flight in Russian MIG to edge of Space ~$20,000
2 day high altitude balloon flight to edge of Space ~$30,000
Seat on Virgin Galactic ~$100,000
Trip to International Space Station ~$20 million