I just got in and bought tix to all three games. There were still seats in Upper Infield Gallery, which is what I went for.
So don't give up, but note there will NOT be a popup window like it says. In my case it just suddenly went to the screen where you type the password. I'm thankful for dual monitors since I shoved the "waiting room" window onto the other screen and answered e-mails in the meantime.