I looked it up, book burning day is the 10th of May.
Pick some books. Burn them.
Some which I intend to burn:
"The Koran"
"What Happened" - Hillary Clinton
"We Should All Be Feminists"
"The Ethical Slut, Third Edition: A Practical Guide to Polyamory, Open Relationships, and Other Freedoms in Sex and Love"
Extra points if you don't pay for the books.