In my copies of Fahrenheit 451, Neil Gaiman introduces the novel with an essay written in April 2013. It's called: “Ray Bradbury, Fahrenheit 451 and What Science Fiction Is and Does”. If the introduction isn't in your texts, here is the full text version: https://glose.com/book/fahrenheit-451-2/introduction-by-neil-gaiman#41
This activity requires you to make copies of the essay for each student. Step 1 directs them to actively read and annotate the text. Step 2 requires them to answer four questions about the essay. They will need to refer back to the text and explain their answers in complete sentences.