When two weddings are accidentally booked at the same venue, each wedding party is challenged to preserve their family’s special moment while making the most of unexpectedly stressful circumstances. In a hilarious battle of determination and wits, the father of the bride (Will Ferrell) and the sister of the other bride (Reese Witherspoon) go head-to-head in chaotic fashion, stopping at nothing to plan an unforgettable celebration for their loved ones.