It's an option when you go through registration, but they sell out really fast. Many people buy them just to flip them. I think they were only 150 bucks last year but this year they were 250 bucks.
IMHO they're not worth it. For 250 dollars you can almost buy a pass for both of you and enjoy an entire day of the parks. You're only getting 4... 4 1/2 hours of park time. I enjoy the party, but honestly 25,000 IT guys, many of whom take "free drinks" as a personal challenge isn't the greatest time. Nothing like getting smashed and acting a fool while wearing a badge with your full name and the company you represent on it.
https://microsoftignite.uservoice.c...microsoft-ignite-celebration-companion-passes