It used to be that Thursday was just the day before the con. You got in town and did some people watching and then rested in preparation for Friday.
Not anymore. Now Wednesday is that day and Thursday is a full day of costumes, setup and even some parties and panels. I set up my art show stuff (mostly), reconnected with artist friends, had dinner at Sear with other friends.
Registration line was nonexistent. Also, sushi by the pound.