Throwing in my 2 cents.
This was my first Kumoriball, and I had hoped it would have been slightly more proper.
To me it ended up feeling like a high school move-your-body-however-you-can event with people dressed in nice clothes. I was also expecting a bit more of classier ballroom-type music. Pachelbel, Mozart...
Even with the music up on the screen, I was confused about when to dance, when a dance ended, and when or what the next one was supposed to be... if classier or more relaxed, if that even makes sense.
What upset me the most was how the line-up "happened" outside. I was one of the people who tried to get in line, then was told by a staff member, that the lining up was ABSOLUTELY NOT HAPPENING at ALL until 30 minutes before the ball so that "other people getting out of panels have a chance to get in line to attend the ball too." The staff member also said that people weren't allowed to hang around nearby either. We were told to go back into the hotel. The people that were lined up were told to leave and return in 10 minutes.
I understand this, and I agree that enforcing no lining up or even lingering around is appropriate, I was angry at how this was handled. When I returned in 10 minutes, not only was the line LONGER, but I was told, by others in line, that people had almost instantly re-lined up.
I was thinking, what, did the staff members leave as soon as they thought the line was gone, and did they not check to make sure people weren't creeping back into line before the specified time? This, to me, seemed like this 'fair attempt' for 'others who were still in panels' didn't work too well.
Oh well. Besides that, I got in and I really enjoyed myself. I hope they do it again next year!