After a Winter Ball that was a mix of fun and worry, seventeen-year-old DJ sets aside her hope for a quiet Christmas and joins Taylor in Las Vegas, although she fears she will do nothing but try to keep her roommate out of trouble.

During the days before her sixteenth birthday, Mia records in her diary her fear that her grandmother and friends may be planning to throw an extravagant Sweet Sixteen party.

Schuyler Van Alen, growing comfortable with her newfound vampire powers, seeks her grandfather in Italy, while back in New York plans are being completed for the fabulous Four Hundred Ball, to be followed by an elite, teens-only event at which masks hide a terrible secret.

Sophie Evans works for the local florist and party planner in her small southern town, so she attends all of the big "events," all the time sketching and dreaming of applying to design school; but this year there is a fly-in-the-ointment of her life--Andrew Hart, son of the fancy new chef in town, who is also at all the local events, keeps getting in her way, making her life more complicated.

Reed learns how difficult it is to be one of the Billings Girls at the Eaton Academy when she is not invited to the huge Halloween party in New York City and she is blackmailed by her roommate into finding some dirt on her new friends.

When twins Sam and Ilsa throw one last party before they graduate from high school, they add a twist, each sibling gets to invite three guests and the other won't know until they show up.

In the summer of 1911, Carney looks forward to hosting a month-long house party at her Deep Valley home with not only her Vassar college roommate as a guest but all the old crowd, especially her high school sweetheart who moved to California four years before.