hmm from experience, I wouldn't dye your hair pink. It's very hard to keep. and it's very very bad for your hair! I once had my hair burned by peroxide and it was like a couple of centimeters short at the top and sticks out like a hedgehog or something. I cried.
my best advice is find a wig, it's much less stressful cheaper and saves having tempory baldness!!
(my hair was SO thin because of it!) now I only wear wigs! and my natural hair is in great condition :)
[EDIT]
If it's just for the con I'd say do itt! but it takes so long to grow out >.<