I know this has been said many times in the past already, and I also take note of the fact that not everyone that attends NDK reads through these forums, but for those of you that do, keep in mind that the best way to keep those elevators running all weekend is to treat them with respect.
I have to deal with these elevators year round and I can honestly tell you all that they rarely break down. Even for other large conventions like starfest, if we have an elevator problem it's normally only one and doesn't slow anything down.
To help you all better understand how this works. When an elevator goes down, for whatever reason, the hotel itself doesn't have the ability to just walk over, flip a switch, and make everything all better again. The company who was contracted to build those lifts has to be called in to repair whatever went wrong and get it up and running. Normally that isn't to hard to do, but they can't always come running everytime we call them. sometimes it takes a day or two. Over crowding, and playing around on the elevators the way some people do during the convention is just a quick way to make the rest of the weekend a real hassle for everyone.
So please do your best to limit the number of people that get on, and don't turn them into a game (I can't imagine riding an elevator to be something all that fun anyway). Word of mouth is powerful on this as well, so ask those that join you to the convention to do the same, please. It'll make all our lives that much simpler.