As the Team Leader of the Anime Evolution 2012 Attendee Services team. I am over viewing the Safety and Security of the Con. I would want everyone to have a safe, responsible and fun time. This is what this is all about, having fun!
With that being said, I agree a dance/ party would be good idea, it has been a big success at other conventions and draws a lot of people in.
With that being said: The Anime Revolution Attendee Services Team will be out in full force if this happens. We will be roaming and be over watching in this party and we don't want people to ruin it for the rest. First off, obviously I would recommend this being an 18+ event only. This is family friendly but it would depend on where it would be and how many people you have as with minors it could get tough to manage. I am just recommending this from my experiences with security, or convention raves, parties, etc.
I would have to say we would need to lay down some solid ground rules, but in the past we have had issues with people drinking or bringing in narcotics, throwing glow sticks at each other or fighting with their cosplays or costumes or the big one..."mosh" pits. Also....in the past people ...well... there was issues of people doing things that were...well...inappropriate if you catch my drift.
I will bring this up and I would like to see where this goes if this happens, lets make sure people have a safe and fun time!