Plot summary
Lip goes to the RV to talk to Tami, finding that she left with Fred and also left a note for Lip that reads "Go fuck yourself" along with her key. He locates her at Brad's house, but she refuses to talk to him, and drives off with Fred.
As they prepare for the wedding, the family is alarmed when they discover that the wedding venue has been burned down. Mickey immediately deduces Terry was responsible, and takes a shotgun to kill him, only to be stopped by Ian and the family. Mickey is handcuffed, while the family considers other options. They settle on a Polish establishment, but due to the venue's homophobic state, they have to pretend Debbie will be the bride. Julia crashes the wedding, despite Debbie cutting off any contact with her. Liam also tricks Frank in attending the ceremony, by falsely claiming that Lip would sell the house without leaving him any money.
At the venue, the Gallaghers distract the owner, Zuzanna Wojcik, by having her "console" Debbie when she cannot go forward with the wedding. With this, the wedding goes as planned, and Ian and Mickey are officially married. Terry discovers about the new venue and angrily drives there, but is forced to retreat when security threatens him. While everyone celebrates, Ian laments to Debbie that Monica could not live to be there for him, knowing she would enjoy it. Zuzanna discovers the real wedding, but Frank distracts her by kissing her. Lip is surprised when Tami and Fred show up, and approaches them before they leave. Lip and Tami get into a heated argument, with Tami proclaiming that Lip loves his family more than he loves her. She is determined in leaving for Milwaukee with Fred, and threatens to go to trial if Lip intervenes. Heartbroken, Lip breaks his sobriety.
Veronica is puzzled when Kevin claims he is making no money at his new fitness business despite getting customers. When she confronts him, Kevin is forced to reveal that he bought an engagement ring for her, and she accepts to marry him. Julia calls Claudia to tell her that she is with Debbie at the wedding, and proceeds to sleep with Carl at his house. Lip visits Brad to ask him in taking him to an AA meeting, which is seen by Tami. The following day, Lip starts working on his new house, and is surprised when Tami joins him to help. The police show up at the Gallagher household to arrest Debbie for sleeping with Julia, and she flees the scene. Ian and Mickey enjoy their honeymoon at a hotel, when they are hit by a drive-by shooting by Terry. Despite damaging the room, they laugh, unharmed.
Credits
Adapted from Wikipedia contributors, Gallavich!. Paragraphs and formatting adjusted; illustrations, reference markers, block quotations and non-story material omitted.