The Boston Book Festival returns for Year Eleven, and this time, it’s a full weekend event for the first time ever. Festival events will take place in Copley Square on Saturday 10/19 and in Dudley Square on Sunday 10/20. Saturday highlights include keynotes by Marie Lu, Elizabeth Strout, Ben Crump, and David W. Blight, as well as a full schedule of discussions, workshops, and interactive events for all ages, plus a street fair with live music, food trucks, and 75+ exhibitors. Best of all, it’s totally free!