Karen and her friends decide to invent a brand-new holiday of their own! Augustania will celebrate the end of summer. And the kids want it to combine parts of all their favorite holidays. The only problem is that they can't decide which ones.

"It's fun to be a Baby-sitters Little Sister! We Heart Cats! Karen's best friend Hannie just got a new kitten. Now all her friends have cats. And Karen has a great idea. She can start a club like her big sister Kristy. It will be a Kittycat Club! What will the club do? Karen can't baby-sit like Kristy...but she can cat-sit! Will anyone want Karen as a cat-sitter? They'd better-running a club is hard work!" -- Amazon.

When their grandmother gives Karen and Andrew pet rabbits in their Easter baskets, their parents are upset, and Karen fears they will not be allowed to keep their new pets when the rabbits begin to chew on things.

Karen adopts a grandmother from Stoneybrook Manor and learns funny dances and listens to old music.

When Karen shows off her roller-skating expertise and accidently crashes into her brother, she ends up with a broken wrist but uses the opportunity to get everyone she knows to sign her new cast.

Karen's having her first sleepover ever! She and her friends are going to tell spooky stories, try on makeup, and raid the refrigerator. But then Karen and Nancy get into a big fight. Karen doesn't want Nancy to come to her party. A new girl comes instead, and she is no fun! What will Karen do now?