What is the main event in Harry Potter and Chamber of Secrets?

In "Harry Potter and The Chamber of Secrets," the main event is the reopening of the eponymous Chamber of Secrets, a legendary hidden chamber within Hogwarts School of Witchcraft and Wizardry. According to legend, the Chamber was built centuries ago by Salazar Slytherin, one of the four founders of Hogwarts, and only his rightful heir could open it and unleash a creature that would purge Muggle-born students.

Throughout the book, mysterious petrifications of Muggle-born students occur on Hogwarts grounds, leaving them frozen like stone statues. Harry, along with his best friends Ron Weasley and Hermione Granger, sets out to solve the mystery of these attacks and prevent further harm to their fellow students.

The trail leads Harry and his friends to various challenges and discoveries, including deciphering riddles and facing magical obstacles and traps, as they race against time to solve the mystery involving the Chamber of Secrets. Ultimately, Harry faces the heir of Slytherin and the creature hidden within the Chamber, leading to a final thrilling confrontation amidst dangerous magical perils.