The Medford Public Library’s book club for second- and third-graders meets to discuss “Planet Omar: Accidental Trouble Magnet,” by Zanib Mian, the first book in a series starring a Muslim boy with a huge imagination. Register through the library’s online calendar, then visit the library to pick up a copy of the book, which will be available starting approximately one month in advance. Please note: This club is only for children in second or third grade.