Just throwing my two cents in here...
Color code based tickets are gonna get ugly, and probably messy. I've been at many conventions over here and it never ended well with this system... That's mostly because we're italians and we do not know how to behave (sadly to admit that and kinda ashamed of my own people) around others, we turn into selfish asses and most of the time it only causes stress and chaos for both attendee and organizer.
Best thing imo would be color code bades ticket AND assigned number of the sit (a personal, one and only sit for the whole weekend) once you've properly registered at the hotel. This way there won't be misunderstandings and nobody can 'steal' your sitting position while you go off to photo/autograph session, bathroom, lunch (?), having to be perfomed CPR -probably only in my case and of course if I get the ticket- because I'm gonna need it after I see all my fav actors...
It'll save us time if TPTB just tell you where to sit, of course you can swap if you find someone who wants to...