For people trying to register to nicovideo, I'm not really sure, it might be one of the options along the top of the site, I think there's one at the top that has the word "premium" in the link, that's the only possible thing I can see.
From the sounds of it there's Mexican waves going on.
If they don't bring Taiji on this live that's seriously unfair to the fansd who only had tickets for the first day who expected to see Taiji.