Two years ago the con reached its maximum capacity and had to turn people away on Monday, maybe on late Sunday. But also during that con we were sharing space with another gathering.
I'm not sure if we reached capacity last year but I kinda doubt it.
This year, I'm not sure how the hotel is in comparison to the others.
But like valliegirl said, get here as early as you can on whichever day. The earlier, the better chance you'll get in without any trouble.