Definitely Hallow's End. Halloween's my favorite holiday in the real world, which means I like it even more in game. :D
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I'd have to go with Hallow's End, always fun throwing pumpkins on particular guildies and getting a good reaction out of it.
Love is in the AirGrabbing The Heartbreaker to make people cry just makes me so, so happy.
Brewfest by a long shot. Beer beer beer :)
Hallows End.
I really like all of them. Each have their own fun and unique things to do, often dailies, that help break up the monotony of most day-to-day WoW routines. I think Hallows End is probably a little ahead of the others for me, as free candy is.. well, awesome!
BEERfest
I like the MidSummer Fire Festival. It's fun to wizz on the opposite faction's fires and run ;)
Lunar Festival, not only do I love the theme, but it will always remind me of something I was living around the time it was first introduced.
hallows end!
hmm brewfest is very cool but i really enjoy hollows end aswell, if i had to choose between the 2 i'd say brewfest! :D