An all-night graduation party aboard a cruise ship is the last chance Michael Olson has to finish his investigation of a murder.

Unlike the other girls in her class, Collette Murphy becomes worried and embarrassed when she is invited to her first boy/girl party.

Their friends must decide which party to attend when Francine schedules her birthday party for the same day as Arthur's birthday party.

The Saddle Club plans a boy-girl hayride for Carole's birthday, but Veronica stirs up trouble when she assumes that she has not been invited.

The Saddle Club members cause major mix-ups when they plan a "bridle" shower for the stable owner and try to get a stablehand certified as a riding counselor.

Everything in Arugula's life is just so, but when she carefully plans and prepares a tea party for her friends, she learns that not everyone agrees on what makes a party perfect.

Albert doesn't recognize anyone at Nicky's Halloween party, even when they take off their masks.

Gerald the elephant, who "knows parties," gives his best friend, Piggie, advice for getting ready after Piggie receives her very first party invitation.

Doris throws a slumber party for Ben and her other monster friends, complete with games, snacks, and an effort to stay up all night.

While trying to find a costume for a party, George looks through Aunt Harriet's attic and makes a huge mass.