Whatever official sampling method was used I am sure it was quite fair and I don't have a whole lot of interest in knowing what it was exactly (random, haphazard etc). If it weren't going to random or close to it why open it up to everyone in the first place? My odds of not being selected were much greater than being selected so I assume it all worked out as it should

Again have fun to everyone who is going! I am sure it will be a great experience! I'll be reading your updates from work