Tommy, Eddie, Barry and Stevie are just four regular guys with day jobs. But when the weekend comes, they become "Mother of the Bride", one of the most hardworking wedding and event bands in Seattle struggling to play the big parties. When Tommy is approached by the woman who broke his heart and is asked to play her wedding, the band has a chance to make a name for themselves with the biggest party planners in town, Rutherford Events.

The band helps 3 nerds get the girl of their dreams by playing at their party.

With no choice, Eddie enlist Tommy to babysit his kids. Tommy has to go with kids for rock star class and miniature golf. He also have to attend a bachelor party of Rachel's fiance, Adam. Adam's best man Cooper turns out to be co-worker and rival of Eddie.