Look smart. Wear something with short sleeves because you're gonna have to roll them up (hygiene purposes). Comfortable shoes (gonna be walking for hours). Oh and don't forget to wear something that's easy to change from and put it in your bag(if you're intending on going to theatre). Try not to bring a huge bag though as it is gonna be a hassle. Drink plenty of water and have a proper breakfast as you may hardly get a chance for a break (long theatre hours).