No, seriously, if you want to seriously know about this, Vlad G. Pohnert is the person on this forum to go to, and probably the only person who's advice on the tech side of this I'd really trust. I had the honour to sit in behind the tech desk with him at a con earlier this year, and that was exactly the setup I'd be looking at were I running an event like this.
On the downside, he's currently heading to AWA so you probably won't hear anything from him for a few days!
As far as copyright issues, those would obviously apply. Anime conventions often work out licensing agreements or just risk it; but technically speaking, unless you have a license permission you aren't supposed to be playing this stuff in public.