How to get rid or lighten dark spots on face from acne in 3 days?

Ok so i have a sweet sixteen to go to on saturday and i broke out like a week before school ended and it left me with dark spots and for dark spots that were already there to darken. Yes i picked at them and i regret it but are there any good home remedies to help the dark spots lighten or disappear in 3 days before the party, thanks c: