I've dyed my hair too dark a colour and instead of being a dark brown it's black my prom is on thursday eeekk are there any home remedies that will fade it QUICKLY?

You could try looking up bleaching remedies for fading hair. You could also buy a hair spray called Sun In the turns your hair a lighter color in the sun. They sell it at Stop&Shop, Walmart, and probably a few different places in your local mall.