Help on summer tan??

So for the past week I have been going swimming every other day and being the knucklehead that I am, forgot to wear sunscreen. I have the most unattractive and weird tan right now. I usually don't tan, I just burn but I guess this summer is different. It's very unappealing though. I have an event in exactly 2 weeks and I was wondering if I stayed inside that entire time, in dark rooms preferbarly, will my tan pale down?? Is there any way to help it pale down? I know it takes time but usually how much time? Any advice is appreciated, thanks!