You may be able to dispute being kicked out of the con if their rules don't explicitly outline that having your head on fire isn't allowed. However, you might find that it's warm and uncomfortable, and it might be hard to do it more than once (say, for future cons).
Anyways, joking aside, there was a topic on this only a few short weeks ago. Not the same character, but maybe some of the ideas will help you. Here you go.