Gloria's plans for a White Christmas don't go as planned.

Claire brings home a stray dog and gets the kids to help her hide it from Phil while she tries to find its owner. Unfortunately, her evasive behavior only makes Phil try even harder to shower her with more attention. Elsewhere, Gloria invites a new couple over even after Jay has made it clear he doesn’t want to make any new friends, but when the husband turns out to be a real guy’s guy, Jay might be eating crow. And Cameron rents out their upstairs apartment to a Christian rock band.

Hayley's plan for a fun-filled girl's day with Rainer Shine's teen daughter may be a little more angst-filled than expected. Meanwhile, Luke finds himself in a compromising position with a widow at the club and unwittingly helps his grandpa, Jay, with his petition. At the Pritchett-Tucker home, Gloria, Phil and Cam have formed a secret alliance to ensure their respective "mistakes" are concealed from their spouses. However, their diabolical plan may be derailed when Mitchell starts suspecting something just isn't right.

Frank Dunphy’s Roaring 20s-themed wedding day is finally here, and to get into the spirit, Phil gets the Dunphy clan to show up in costume. Once Claire and the kids realize they are the only ones dressed-up, they feel it’s time for a “funny” intervention with Phil. Meanwhile, Jay has mastered the art of saying no, but soon realizes that if you say no too many times, people stop asking; and Cam is in for a big surprise when he finally stops hiding behind Mitchell and stands up to his sister Pam.