I’m horribly sunburnt and i have prom

Ok so i need help asap. My graduation is tomorrow and prom is in 4 days and i got THE most awful red lobster sunburn, and it’s also uneven because i was wearing short sleeves. It’s all across my lower and mid upper arms, and there’s also a weird line behind my neck. the sunburn is also patchy because i had residue sunscreen on from my face. Thank god my face is at least fine and the makeup can look good but both my prom and grad dress are strapless and i have no idea what to do. One of my main ideas was to attempt using tinted sunscreen but the logistics of that are that they’ll get the dress dirty. I’m being told to get the rest of my upper half burnt so that it’s at least even and doesn’t look strange, I’m reluctant to do it because i know that’s absolutely awful for your health and you shouldn’t do it but i’m unsure what to do. If the rest of my upper body burns like my arms i’ll also be in worse pain.