Kristy's mum is getting married, and Kristy is going to be a bridesmaid! The only problem? Fourteen kids are coming to town for the wedding. Kristy, Claudia, Mary Anne, Stacey, Dawn, and Mallory think they can handle it, but that's before they spend a week changing nappies, stopping arguments, solving mix-ups, and planning activities. It's the biggest job the Baby-Sitters Club has ever had, but they'll work together to make sure Kristy's big day is a success!