REALLY BAD SUNBURN will it go away?

ok so i went to the beach today and i put on sunscreen but it didnt help cuz i got a really bad burn on my shoulders and back-u can see the bow tie from my bikini =( but ive been putting aloe on my back, took hot and cold showers and pain killers. but im going to a party on the fourth of july, any chance it will be gone by then? its REALLY red but no blisters..