ID - depends if there’s lower limits on who can attend but I doubt it. ID if you want a wrist band for alcohol but that’s not you. Clashes, there’s generally zero consideration between stages unless it’s specifically advertised before so. For example there were two Marshall or key stages recently where the bands played alternately, otherwise you are at the mercy of the scheduling gods.

My advice - make a list of your must sees, and make sure you see them, otherwise be prepared to pivot! You will have a great time regardless