Write a quiz about your favourite book.
It should include 20 questions which you would have to have read the book to answer - not just from the cover/title/blurb!
Have a range of different questions. Some might be multiple choice, true or false etc.
Take a look at the Book Trust website https://www.booktrust.org.uk/books-and-reading/have-some-fun/fun-at-home-with-authors-and-illustrators/ Try and join in with one of these activities. Lots of great authors are reading their books aloud and for free!! They also have quizzes and activities on their website for you to get inspiration for yours.