When a shy groom has his bachelor party in Las Vegas, he is perfectly content to spend it relaxing at the bar, even after his uninhibited fiancée tells him he should use the weekend as an opportunity to gain “more experience.” But when the bachelors cross paths with the feisty bachelorette party, sparks fly. The groom takes his fiancée’s words to heart, leaving the best man and maid of honor scrambling all over Vegas as they attempt to save their friends from a night of epic “mistakes” – because what happens in Vegas doesn’t always stay there.