Clay Vanstone is the fun-loving branch manager of a tech company who loves his employees like a family. His sister, Carol, however, is the company's CEO and is all about the bottom line, not sharing her brother's relaxed approach to management. When Carol threatens to close the underperforming branch, Clay and his Chief Technical Officer, Josh Parker, face the challenge of saving their jobs and those of their co-workers. They decide the solution is to land a big client, and in an attempt to impress him, they plan to throw the most epic Christmas party to convince the potential client that their company is in good standing and full of team spirit.

The party plans escalate quickly, with Clay and Josh being joined by Tracey Hughes, the head of tech innovation, who aids in orchestrating the festivities to help save the branch. As the party kicks off, it becomes clear that this will be no ordinary office holiday event. The entire office gets swept up in the festivities, which start to spiral out of control. With every passing hour, the celebration becomes more extravagant and chaotic, leading to a wild night filled with unexpected twists. The party takes on a life of its own, testing friendships, careers, and the future of the company itself.