Mine is Winter Veil, because i love the build up to Christmas and when Winter Veil Starts i know its getting close to Christmas (other then knowing by the date of course :P)
I think Halloween is one of my favorite holidays. It is the holiday that helped get me interested in playing WoW. It also gave me one of my first pets. I also like the other holidays that allow you some way of getting pets without having to rely on a once a day random chance. Runner-ups would be: Thanksgiving for the self-cooking turkey pet (too bad we can't eat it when it is done), Noblegarden for all the candy and bunnies, and Winterfest for all the holiday fun.
Brewfest is my fav so far, havent been playing very long so I havent seen them all yet
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I would say, winter's veil. Its absolutely fun to watch people fly around on flying reindeers! After all, they've gotta be the rarest mount in game, closely followed by other festive mounts which dont last ): Its also massively fun to throw snowballs at people. Heh heh heh >:)
I love Hallow's End. It's a great way to get a very cool mount and a fun way to level lower level characters!
Midsummer Fire Festival ! There are tons of nice quests, cool gear ( both those for fun, but also Ahune's !) and its just fun (: Maybe my favorite time of year !
I've been playing WoW for a very long time and I never had anything would really love to get something special. I love Hallow's End so much. Killing the Headless Horseman, getting Jack'o'Lantern'd and stuff. It's a lot of fun :D I have been farming the mount for two years but it hasn't dropped for me on any of my characters yet, unfortunately...
I like Children´s week and eating icecream.
Pilgrim's Bounty - Because it brings players together in these troubled times, we share our table and our food to those hungry, those in need and those lonely, and I would like to believe that the sharing spirit transcends through the screen and into players' hearts. ...And I get to shoot me some rogues! Yeah, baby! Die you sneaky bastards, die!
I'm a fan of Halloween :)
brewfest as most people already said for being the most active holiday(except holidays which have achies to fly all over the worlds) and a unique feeling due to music, NPC animations,dark iron attacks etc etc...