When two weddings are accidentally booked on the same day and at the same location, each wedding party is forced to preserve their family's special moment by making the most of unexpected, cramped spaces. In a hilarious battle of determination and courage, the father of the bride (Will Ferrell) and the sister of the other bride (Reese Witherspoon) go head-to-head in chaotic fashion as they stop at nothing to plan an unforgettable celebration for their loved ones.