Hank Cherry, a NC boy.
Sam gave a great tutorial. I would add these. The Expo is huge and like Sam said it's like being a kid in a candy store. But, it makes for a long day if you get there at 9, catch the bus to the weigh-in around 2(?) ... You will more than likely get back to your room around 8 pm. Dress comfortably, take breaks, sit from time to time, and be prepared to be in a crowd.
Since this topic is already here, sound off if you're going. I'll be there Saturday and Sunday.