Donna, an independent hotelier, is preparing for her daughter's wedding with the help of two old friends. Meanwhile Sophie, the spirited bride, has a plan. She invites three men from her mother's past in hope of meeting her real father.

Part of the reason we still talk about Mamma Mia! is the fact that it's a chaotic explosion, which elevates the magic & romance of the story.
Mary Kassel
Screen Rant