Thousands flocked to Copley Square over the weekend for the Boston Book Festival, which featured three days of quality time with hundreds of authors and publishing types. Salman Rushdie, author of “Midnight’s Children,” “The Satanic Verses,” and “Joseph Anton: A Memoir,” gave the keynote address at the Old South Church on Friday night. Saturday presenters included J. Courtney Sullivan, Milton native and author of “Maine” and “The Engagements” (which has been optioned for film by Reese Witherspoon), who shared the Trinity Church sanctuary with “The Leftovers” author Tom Perrotta; “Reunion at Red Paint Bay” author George Harrar; and Ann Leary, who wrote the North Shore-inspired novel “The Good House” (which is being turned into a film starring Meryl Streep and Robert De Niro). Those four headlined a panel called “Domestic Disturbances,” moderated by “Here & Now” host Robin Young. Sullivan and Perrotta were later seen chatting with Oscar-winner Chris Cooper and his writer-actress wife, Marianne Leone Cooper. They joined the couple in the audience for another panel that featured Haverhill-bred “Townie” and “Dirty Love” author Andre Dubus III. “The Woman Upstairs” author Claire Messud shared her “Heroes and Antiheroes” discussion at the Old South Church with Chuck Klosterman and Harvard’s Center for Hellenic Studies Director Gregory Nagy. And while those grown-ups talked shop, there were plenty of activities for young people, including appearances by Marissa Meyer (of the sci-fi fairy tales “Cinder” and “Scarlet”), “The Raven Boys” writer Maggie Stiefvater, Newbery Medal winners Lois Lowry and Jack Gantos, and Tomie dePaola, of “Strega Nona,” who delivered the Kids’ Keynote on Saturday morning at Old South Church.