Fact1: Jim be allowed to attend wedding, Fact2: Leslie agrees to make dress for Michelle and hits on Kevin, Fact3: Stifler arranges bachelor party including strippers for everyone at Jim 's house except Jim, Fact4: Michelle 's mother is shocked to find Kevin inside, Fact5: Jim 's paternal grandmother dislikes for not being Jewish and about Stifler 's invite to wedding
Output: While on a date in a fancy restaurant with Michelle, Jim is ready to propose to her. His father calls to inform him that he has the ring. Michelle misinterprets when Jim stalls the question. Jims dad arrives as Jim is receiving fellatio, and a mishap grasps the restaurants attention. Jim proposes and Michelle accepts. Jim wants to exclude Stifler from the wedding, having concerns that Stiflers behavior isnt socially acceptable. When Jim is worried about learning the dance, Stifler agrees to teach Jim to dance, and over time to tone down his obnoxious personality, in exchange that he be allowed to attend the wedding and host a bachelor party. The boys go on a road trip when they discover there is only one designer who makes the dress that Michelle wants. They go to Chicago looking for Leslie Sommers; Stifler unwittingly walks into a gay bar, and his raucous behavior gets him into a dispute with several patrons. Stifler challenges Bear to a danceoff, wins, and Bear offers to provide strippers for the bachelor party. Leslie reveals himself and agrees to make the dress for Michelle and hits on Kevin, who is uncomfortable with the unrequited attention. Michelles parents, who were initially skeptical of Jim, agree to have a preliminary dinner with him. Michelles younger sister, Cadence, flies in for the wedding. Both Finch and Stifler are attracted to her, and in an effort to win her over, they each adopt the others personality and mannerisms. Stifler arranges the bachelor party, including strippers, for everyone at Jims house except Jim, who unknowingly has arranged dinner with Michelles parents there. The party is abruptly halted by the unexpected return of the three. With assistance from Bear, who poses as a butler named Mr. Belvedere, Jim nearly succeeds in keeping the activities a secret, until Michelles mother opens a closet door and is shocked to find Kevin inside, stripped to his boxers and tied to a chair. The boys explain that it was an attempt to make Jim seem like a hero that went wrong, and Michelles parents accept this and tell him that if he puts that much effort into the upcoming marriage, she can give her blessing. Michelle has doubts regarding that Jims paternal grandmother dislikes Michelle for not being Jewish, and about Stiflers invite to the wedding. On the night before the wedding, Stifler inadvertently disrupts the walkin refrigerators power supply while retrieving a bottle of champagne in an attempt to lay down Cadence. Previously, Stifler, unaware of Cadences presence, had revealed his true rude and obnoxious personality. When Stifler later returns, the flowers are dead. Enraged, Jim asks him to leave, and all the others, including Cadence, support Jims decision. Feeling guilty for his thoughtless behavior, Stifler convinces the florist to put together a new batch of flowers, and he enlists the help of his football players and Bear. As a gesture of remorse, he also gives a rose to Cadence, much to the amazement of Jim and Michelle. Moved by his actions, Cadence agrees to have sex with him in a supply closet before the ceremony, but Stiflers presence is delayed by a brief thankyou meeting Jim calls among his groomsmen, citing how he is grateful to have friends like them to back him up. Quickly returning to the hotel, Stifler hears someone in the supply closet and steps inside, unaware that Cadence was interrupted by wedding preparations and that the ushers, the MILF guys from high school, placed Jims grandmother in that closet to sustain her hostility about the wedding; Stifler only realizes this upon walkin by Finch and the ushers. She becomes pleasant, particularly towards Stifler, making Michelle and Jims dad unknowingly happy. Despite the chaotic events leading up to it, Michelle and Jim get married. At the reception, the couple dances while Stifler dances with Cadence. Finch is sitting by himself when Stiflers mom arrives. Although agreeing they are over each other, Stiflers mom mentions having a double suite and invites Finch to join her. The film ends with the MILF guys spying on Stiflers mom and Finch in her suites couplesize bathtub, having oral sex.