The plot of "Oggi Sposi" follows the story of three couples who decide to get married on the same day, in the same location - a luxurious villa in Tuscany. The first couple is made up of Andrea (Luca Argentero) and Giulia (Isabella Ragonese), a pair of high school sweethearts who are finally tying the knot after years of dating. The second couple is made up of Tommaso (Dario Bandiera) and Sara (Moran Atias), two strangers who meet and fall in love while planning their weddings. The third couple is made up of Martina (Carolina Crescentini) and Luca (Giorgio Faletti), an on-again, off-again couple who decide to give their relationship one last shot.
As the wedding day approaches, tensions begin to rise among the couples as they encounter unexpected obstacles, from a last-minute venue change to meddling parents and scheming exes. As they navigate these challenges, each couple is forced to confront their own fears, insecurities, and doubts about their relationships, and ultimately decide whether or not to go through with the wedding.
Throughout the film, there are also various subplots involving the supporting characters, including a love triangle between two of the wedding planners and a handsome bartender, and a comical mishap involving a runaway wedding cake. But in the end, it is the three couples and their journeys towards love and commitment that drive the heart of the story.