Sergio Aragones at Book Soup

Marginalia — the notes and doodles scribbled in the white space of printed material — is usually an afterthought, but for Sergio Aragones, it’s an art. The prolific illustrator has long filled the margins (and pages and covers) of Mad magazine with keen cartoons that have helped define the publication’s irreverent sense of humor. Aragones’ work has been collected in the new book “Mad’s Greatest Artists: Sergio Aragones,” which he will sign and discuss. Book Soup, 8818 W. Sunset Blvd., West Hollywood. 5 p.m. Sat. Free. (310) 659-3110. https://www.booksoup.com.