WA states are supposed to be on March 20th at either South Center Mall or Seattle Center. The only REAL clues we've been given were that the location 'is said to be somewhere with center in it's name' on March 20th.
I personally don't expect an announcement until about a month before, and as for preparations, yes I understand hotel fairs, etc being important and all, but at least you can work on what you'll PLAY.