This set includes black and white calendars for June, July, and August in English and Spanish. Each day has an activity the students can do at home that asks them to read something. Most don't take very long to do and they can do many in one day.
I suggest that they do these in any order and they don't have to do them on the exact date. They cross out each date that they complete. When the summer's over they can return these calendars to their next year's teacher and they will return them to you.
Let the teachers in your building know that you have done this so they can send them back to you. (You can put a label on the back with your address, if you think a student might move during the summer.)