One great choice is a book club, but they take a little planning ahead.
Ms. Woznick is going to be reading 2-3 chapters a day of the book From the Desk of Zoe Washington starting on Monday, June 29 from 9:00 - 9:30 am. Students can listen in, and get access to some other information and have brief discussions each day for 3 weeks. Alternately, they can read the book on their own time and join periodically or for the final meeting on July 10. For more information, see this flyer.
Slightly older students may enjoy the virtual book clubs being run through the Beverly Public Library for Truly Devious on July 1 or Gone on July 31.