I personally think that dance is a sport.
It requires a lot physically and mentally.
You will need coordination, balance, and strength in most dances (ballroom, hip hop, etc).
It also requires a lot of practice and determination just like any other sport.
Well, you can wear water-proof make up or something and for your hair, I suggest just getting a re bond since i doubt that there would be any sort of electric outlet for your hair straightener.