When two weddings are accidentally booked for the same day and at the same location, each couple is challenged to preserve a special moment for their family and make the most of the unexpectedly cramped space. In a hilarious battle of determination and courage, the father of the bride (Will Ferrell) and the sister of the other bride (Reese Witherspoon) face off chaotically as they stop at nothing to throw an unforgettable celebration for their loved ones.