OK, I can see a potential problem here

[gmonkey42]

Re. Lumos stickers: I checked the Message Board and apparently we just have to pick a color when we come in and register on Wednesday or Thursday. The idea about telling people your color is that people can plan to have the same color so they can sit together. But what if a ton of people say ahead of time "I'll pick red" and then there aren't enough red stickers? I don't care, I'm just going to pick one when I get there.

I'm all depressed today and I'm starting to worry that I'll have a crappy time at Lumos :(