This whole area is divided into streets and a town is formed. Ten thousand people take a lot of feeding and porta-potties etc. Everyone at the event has to be in period costume the whole time. No spectators, and you pay by the week. You camp, as near as possible, in period style tents or pavilions, and cook over an open camp fire.
All lighting is by candles and lanterns.
Many established encampments have walls and wooden battlements and towers set up, and round the clock guards. It is like you have stepped back a thousand years to Byzantium. I had put together a day wear, several skirted, outfit to wear. Here is a photo of my friend Nora tying me into the outfit. She is wearing a first millenium AD celtic outfit.