Panel Discussion. 6:30 p.m., 57th Street Books, 1301 E. 57th St., 773-684-1300, free. Four Chicago-area authors will discuss diversity in children’s books and writing underrepresented characters in their own work, in a discussion hosted by the Society of Children’s Book Writers and Illustrators’ Hyde Park/South Side Network. R.S.V.P. by sending an e-mail to Kate Hannigan at firstname.lastname@example.org.