<P> A sequel, titled Mamma Mia! Here We Go Again, is scheduled for a July 20, 2018 release in the United States with Seyfried, Streep, Firth, Brosnan, Baranski and Cooper returning to reprise their roles . </P> <P> On the Greek island of Kalokairi, bride - to - be Sophie Sheridan reveals to her bridesmaids that she has secretly invited three men to her wedding without telling her mother, Donna . They are the men that her mother's diary reveals could have been her father: Irish - American architect Sam Carmichael, Swedish adventurer and writer Bill Anderson, and British banker Harry Bright . She dreams of being given away by her father at her wedding, and believes that after she spends time with them she will know which is her father . </P> <P> Sophie's mother Donna, who owns a villa, is ecstatic to reunite with her former Dynamos bandmates, wisecracking author Rosie Mulligan and wealthy multiple divorcée Tanya Chesham - Leigh, and reveals her bafflement at her daughter's desire to get married . Donna shows off the villa to Rosie and Tanya . The three men arrive and Sophie smuggles them to their room . She does not reveal that she believes one of them is her father, but does explain that she and not her mother sent the invitations . She begs them to hide so Donna will be surprised by the old friends of whom she "so often" favourably speaks . They overhear Donna working and swear not to reveal Sophie's secret . </P> <P> Donna spies them and is dumbfounded to find herself facing former lovers, demanding they leave . She confides in Tanya and Rosie that she truly does not know which of the three fathered Sophie . Tanya and Rosie rally her spirits by getting her to dance with an all female ensemble of staff and islanders . Sophie finds the men aboard Bill's yacht, and they sail around Kalokairi, telling stories of Donna's carefree youth . Sophie plans to tell her fiancé Sky about her ploy, but loses her nerve . Sky and Sophie sing to each other, but Sky is abducted for his bachelor party . </P>

Where was the wedding scene in mamma mia filmed