There is no aptly named male equivalent. Man party? Dude gathering? Sausage fest? The only images conjured are negative ones. The implication clear -- girls didn't want to hang out with us... we couldn't get dates... this party sucks.
You on the other hand, Girls' Night Out, seem organized and exclusive. You've got your stuff together. I don't really know what you do, but I imagine it's a super fun time that involves trading tampons.
Yes, the men may have a better slogan, Bros before Hoes. but you have the better hangout name. In fact, men don't even have a name. And until they do, they don't have a chance.
Stuck at a Dude Party