What was the most important event that occurred in the book Brave New World?

In Aldous Huxley's "Brave New World," the most important event is the arrival of John the Savage in London. His exposure to both the "civilized" World State and his upbringing on a Native American reservation highlights the stark contrasts between the two societies. John's struggles to reconcile his values with the hedonistic, technologically advanced world lead to tragic consequences, ultimately serving as a poignant critique of dehumanization and the loss of individuality in a conformist society.