If you are a vendor do you just show up at 5 am Sunday morning and pay your rental fee when you get there?

Better to call ahead

You do not need to be there at 5 a.m. and wait in line but you do need to pay before you go in

Yup. Show up, pay, sell

Show up and drive through booth to pay rent then set up...early is better. They usually start clearing the line to go in about 6 am