Crygil wants to know: if you could design a new holiday for the game, what would it be? I don't think I've ever heard the question asked before -- holidays are really just optional fun for more players, and Blizzard has always covered the basics (Christmas, New Year's, Thanksgiving, Halloween, etc.), and even added in some of their own by giving real-world holidays some Azerothian flavor (Midsummer Fire Festival, and of course Brewfest). Are there really any holidays they missed?
I guess Labor Day and Memorial Day are the two biggest ones -- maybe all of the NPCs could take a day off, there could be giant barbeques set up in the capital cities, or players could take a day to remember those fallen in the past wars. Or you could go another route and just make up your own holiday: Grumpyfool of Azjol-Nerub recommends Gnome Appreciation Week (a whole week?), where Azeroth's shortest denizens can get some love of their own. A more recently based holiday might be fun, too -- maybe once a year we could remember Arthas' (it was Arthas, right?) zombie attack on our homeland.
I doubt this is going to be used to determine actual Blizzard policy. Seems more like just a fun thought experiment. But there are definitely some interesting ideas in there -- if Blizzard ever wants to add yet another holiday to the calendar, there are plenty of ideas.