I like the idea of this. I personally am not a big fan of dancing, so I most likely wouldn't attend with my busy schedule and all. You should keep in mind that the way you teach and the attitude towards people learning, especially the ones that just aren't getting it as fast, could make or break the panel. The goal is to make others happy, because it is really about them. Keep that in mind, and you will have an amazing panel. Good luck
Great words of advice. I've done dance panels at other cons in the past as well as teach anime/k-pop/j-pop dances at this studio I attend and it's really hard to do it in a way where everyone's happy. Some people are easier at learning dances while other people can take hours to get the simplest of dance moves. I know in the past when dancing with my friends, they'll spend hours working on a thirty second portion of a dance no matter how complicated, while I myself can watch it a few times, jump in and have it down without much practice at all.
During the panels I've done, if it is too easy for some people and you're having to repeat a lot of steps for stragglers, they'll leave or get really bored. And it's a fine line between giving them enough time to learn it and giving them enough time to practice and sync. You don't want advance dancers to be bored waiting around for others to catch up and you don't want beginners to get frustrated when you move onto step B but they're still unsure how to do step A.
So when picking the dances, I'd stick to ones that have only five or six simple moves (para para style is easiest) and go from there. Little Apple, Saikyou Pare Parade, Boogie Bam Dance and Yuki Moun Madobe Nite are the four dances I usually do as beginner dances that anyone can learn in about a half hour, if that since they're literally the same moves over and over again. Ones like Love and Joy and Luka Luka Night Fever seem simple enough but can be more complicated to do, especially if you only have an hour to teach.
Long story short, be very selective with your dances. One thing you could do is two panels. One for beginners and one for more advance dancers. I'd also stick to doing only one or two dances depending on the level everyone's at but keep others in your pocket just in case.