Molly's new lab partner in science class is Nick's current girlfriend, with whom Molly soon bonds after Nick dumps the popular girl. Meanwhile, Jerry arranges to take Mary to a swing-club outing to celebrate their anniversary, not realizing that it's not a dance group but rather a spouse-swapping coterie.

Molly teaches Rick how to be sensitive when he starts dating a new flame, but her efforts backfire when the woman dumps him. Meanwhile, Mary is obsessed with documenting her mother's past.

Mary enters Molly into the town's yearly Quahog Festival Pageant, which Molly doesn't even want to participate in until the teen hears someone insult Mary about her involvement in a previous competition. Meanwhile, Jerry recruits Grant to help him build a float for the festival's parade.