A lot has been covered, so that's really great! One thing I sometimes do is take off my wig. My hair is curly and hard to press down, so sometimes wigs and wigcaps can make my head hurt after being at the con all day. Also, DRINK YOUR WATER!!!!!!
You may feel like you don't need it, but you do! If you ever feel like you are going to pass out or even feel light-headed, sit down crossed legged and put your head between your knees. Also, be careful at night. The later it gets, the more creepers come out. Bring a buddy and know where con security is. One last thing, if you get lost or are in need of help, ASK SOMEBODY!
Most con-goers are very friendly and are more than willing to help. Just use your head and make good choices, and your con should run smoothly