Book Beat Bookstore in Oak Park is celebrating the third National Independent Bookstore Day on Saturday, April 28, with local authors signing their latest books, an author-recommended shelf, and special book-related goodies available only on that day, including a limited edition "Read, Think, & Create Tik-Tok of Oz" book bag free with a purchaseIndependent Bookstore Day is a one-day national party that takes place at indie bookstores across the country on the last Saturday in April.