Have your students work together to choose the books that they most like to trade with another class. The other class does the same with their own set of books. Bring the two classes together, and have each group say what they like about the books that they chose. Take the books back to your own classroom, and you can then let children borrow the books or read them together as a class and count them for the MS Readathon. After a set amount of time, come together again to return the books and allow pairs of students to discuss what they thought of the books that they read.