When two weddings are accidentally booked on the same day at the same venue, each bridal party is challenged to preserve the special family moment and make the most of unexpected moments of tension. In a hilarious battle of determination and sincerity, the father of the bride (Will Ferrell) and the sister of the other bride (Reese Witherspoon) chaotically battle each other while stopping at nothing to organize an unforgettable celebration for their loved ones.