What is the main events in fudge a mania?

In "Fudge-a-Mania" by Judy Blume, the main events include Peter Hatcher's interactions with his quirky younger brother, Fudge, and their family's summer vacation which involves spending time with their nemesis, Sheila Tubman. As the story unfolds, Peter navigates the challenges of sibling rivalry, friendships, and family dynamics while learning important life lessons along the way.