I am visiting my girlfriend at Northwestern right now, and I have found the guy in charge of everything for the physics department, so I have been pumping him for information. He told me there will be two open houses about a week apart, and he told me the exact date, but I don't remember it right now. He also told me that I was in the first wave (acceptance or rejection, he didn't know which), and that those decisions would be sent out by Friday. He also knows about a second wave, but I don't know exactly when that will be happening. I got the impression it was shortly after the first wave, but I realize that that doesn't make much sense.