Little black dress w/ rhinestone accents- how to do my nails?

A dark red would look elegant. Also, I would suggest a dark purple or royal blue with a slight metallic undertone. Since you have 6 days, wait about 4 to 5 days then do your nails so they are slightly longer. If all else fails, get them done at a nail salon. You don't have to get fakes just ask for a manicure.