It's the wedding of Jim and Michelle and the gathering of their families and friends, including Jim's old friends from high school and Michelle's little sister.
Matt Stifler wants to be just like his big bro, making porn movies and having a good time in college. After sabotaging the school band, he gets sent to band camp where he really doesn't like it at first but then learns how to deal with the bandeez.
A high school virgin, who is eager to have sex, gets a guilt free pass from his girlfriend to lose his virginity while attending college parties for a whole weekend.