Emma Allan and Olivia "Liv" Lerner are best friends who have planned every detail of their weddings, since first witnessing a wedding 20 years ago at the Plaza Hotel. They both have made it a priority to be married in the same location in June. The two get engaged at the age of 26, and are expected to be each other's maid of honor. They schedule their weddings with New York's most famous wedding planner, Marion St. Claire, but due to a clerical error they are scheduled to have a wedding on the same day, June 6 (three and a half months later).