Well, you do know the event lasts for the next week and a half (it ends on New Year's Eve, when it will be replaced by Heavensturn), so you should have plenty of time to get it done (and besides, some of the gear won't even be available til Christmas Eve, so it's not like you can even get everything today anyway).

Based on previous seasonal events it's likely the actual Christmas themed armour would be gained through the actual questline as a reward anyway, so I'm guessing the dailies will reward the other items (the furnishings and stuff).