Frank Dunphy's wedding has a Roaring '20s theme, so Phil gets his clan to show up in costume, but Claire and the kids realize it's time for an intervention with Phil when they're the only ones who dressed up. Meanwhile, Jay comes to regret mastering the art of saying "no"; and Cam finally gets the courage to stand up to his sister Pam.

Mitch and Jay separately seek out a much-needed retreat from their families, and end up at the same resort. Meanwhile, Phil and Claire can't seem to enjoy the empty-nester life, and Cam, not knowing what to do with himself while Mitch is away, drops in on Gloria's to lend a hand.