Not selection then, I would say, put all the names of the guilds that can be nominated inside hollow balls, put them on a bingo machine and start turning it. Also you could make bets with people about which guilds would go on the game, and play a bingo after it.

Or just make another way of random selection, of course a d100 isn't a very practical idea.
Or much easier, I'll send my nomination hoping it's not too late and you go send yours too.