I need some feedback in regards to going out & breastfeeding.

My daughter was born in November & i plan on having some friends visit in April. My parents will be watching her for the night while mommy has some well deserved drinks.

I know the duties of breast-feeding requires me to pump. But are there any suggestions in regards to carrying around a breast pump & going into the damn bathroom to do so...anything i can wear that someone has had success with?