When Cory finds out that Eric is the one planning an underground rave, he sees a chance to make a name for himself and he wants in.
While in the midst of planning, they discover that Alan and Amy's anniversary is the same day as the party. Amy over hears the boys making plans and mistakenly thinks they are planning a surprise party for the anniversary. Now, Cory and Eric have a problem.
Cory suggests cancelling the rave and focusing their efforts on planning an anniversary party. Eric, loathe to lose a chance at being a high school legend, wants to try and throw both parties.
When Cory arrives at the rave and finds out about Eric's plan, he tries to move all the anniversary guests across the street to a different restaurant. The boys are out of luck, when their parents show up and figure out what's going on. Visibily upset, they turn to leave; but Cory hastily assembles a band of friends of Alan and Amy and has them play their wedding song, "My Girl". Appeased, the parents return and try to enjoy the party.
Meanwhile, Reginald Fairfield, an irritating Brit who followed Amy and Alan on a college back-packing trip around Europe, arrives in Philadelphia and asks to stay with the Matthewses.