…summer adventure with her friends

Main Girl comes running out of her house into a convertible car with her girlfriends for one last summer fling before settling down to marriage. They go to one of her friends, Summer Home. I remember a keg party at the house and at the end of the party, toilet paper all over the trees and lawn. Also in town there was a dance contest (like a sock hop) and some of the kids signed up for it. The Main Girl that’s engaged meets a boy I beleieve his name is Bud and loses her
virginity on a boat and they fall inlove.
The only other thing I can remember is one of the girls finds out she is pregnant and at the end of the party next day…All the kids are sleeping, house is destroyed and parents are on their way to the house.