STAY AWAY FROM THE DEALER'S ROOM! I made that mistake at Anime Next. I will never make it again.
Stay out of tight places. If you have to be inside, stay out of panels, narrow hallways, etc. Also, I find it really, really, REALLY helpful to have a "handler" with me. In my case, my cousin. I can't see behind me or too far to my left or right in my cosplay. So he guides me around when I absolutely MUST be inside.