A lot has changed since you competed, sinecure...
The SD can nominate the series champion, and the second place finisher as his alternate. after that, there is a national ranking list. the field gets filled from that list. the days of "wildcards" are long gone, and petitions need to be backed with historical data to justify a spot, and doctors documentation of injury. Other than that, pretty tough to get in.
King -
If its only Slalom you got in for you should still come. you can learn a lot up at the top of the course, meet some coaches, find out about programs, and gage your level of riding. Additionally, you can volunteer to forerun either course, after your competition is over. PM me your name, I'll look at where you stand on the NRL, and give you my opinion on the liklihood getting a GS bid as well...
-Noah