wear sunscreen. even if you're wearing clothes wear sunscreen. reapply every two hours or at least what it says on the container.
I'm not kidding. it's annoying, i get it. wear it.
I don't want to see waves and waves of the left fighting with melanoma in ten years even if it only ends up being 0.1% of you. you will be there longer than you expect, either because cops or because other things.
and you sure aren't going to be as useful at the next event when you're still nursing peeling sunburns. wear it.