Children's Week.
Hallow's End.
My favorite, like many others it appears, would have to be hallows end.
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Hallows End my favourite even the mount never drops for me :(
Nothing beats Brewfest
Children's week, and especially the achievement School of Hard Knocks. 'Cause that's how you raise a child.
pirate day :)
My favorite WoW holiday is Halloween (Hallow's End). I think it is the most well constructed as far as achievements are concerned. A very good balance of PVP and PVE (with the scales leaning toward PVE, which IMHO is "balanced").
Tough one. I think it would be Brewfest with goat riding and beer drinking. Fun!
Thanksgiving's the best...can work your cooking up from 0-350 in a matter of hrs with very little effort.
Definitely Hallow's End - too good for my undead hunter to pass up.