Take in the scene
To figure out where to position yourself for the best views and people-watching. Is there a stage? Do you think the surprise performer will be worth Insta-storying that close-up? Stick around there, or at least head back to it as soon as the DJ starts dying down. Is there a semi-closed off section or tables with little reserved signs on them? That's where the A-listers will be, if there are any.
[Photo via @ralphlauren]