Two fathers with opposing personalities come together to celebrate the wedding of their children. They are forced to spend the longest week of their lives together, and the big day cannot come soon enough.
The Week OfSarah Lustig and Tyler Cortice are one week away from their wedding. Despite Tyler's father, Kirby, being a wealthy doctor, Sarah's father, Kenny-a humble construction worker-insists on covering all the wedding expenses, resulting in a low-budget affair.
As the wedding approaches, chaos ensues. Determined to impress Kirby, Kenny arranges to have his hotel room upgraded to appear more luxurious. However, a series of blunders by the hotel staff damages adjacent rooms, forcing both families to squeeze into the already crowded Lustig household. To make matters worse, the hotel is also the venue for the reception, and the damage threatens the event. Despite Kirby's offers to help, Kenny stubbornly refuses, determined to handle everything himself.
Meanwhile, a misunderstanding leads to Kenny's elderly uncle, Seymour, being mistakenly celebrated as a World War II veteran, though he never served in combat. When accusations arise, Kenny persuades the mayor to host the reception at City Hall under the guise of a party honoring Seymour. However, during Tyler's bachelor party, Seymour tragically dies in a bizarre accident. Kenny is forced to confess that Seymour's supposed war injuries were actually due to diabetes, leading the mayor to cancel the event. Desperate to save the reception, Kenny, his wife Debbie, and Seymour's son Charles hatch a wild plan to release bats into City Hall via the chimney as a distraction.
Despite the chaos, the wedding day begins smoothly, and the ceremony is a success. During the reception, Kirby confronts Kenny about his erratic behavior. Kenny admits his actions stemmed from a heartfelt desire to do one last meaningful thing for his daughter before she started her new life. Unfortunately, their conversation takes place while they are being carried on a platform during a dance. The platform collapses, spilling water onto the electronics, which causes a fire.
Ashamed but remorseful, Kenny confesses his feelings to Sarah, who forgives him. The families rally together, moving the rest of the celebration to the Lustig home. By the end of the day, Kenny and Kirby reconcile, agreeing that Kirby will cover the cost of a family vacation, marking the beginning of a new, harmonious chapter for both families.
