Brookline: Best-selling author Jodi Picoult returns to the Coolidge Corner Theatre at 290 Harvard St. for a talk about her newest novel, “Lone Wolf,’’ Wednesday at 6 p.m. $5. 617-734-2500, www.brooklinebooksmith-shop.com.
Arlington: Margot Fox performs family-friendly folk-rock music and celebrates the release of her third CD, “Planet Clementine,” Saturday, 10:30 a.m., at the Regent Theatre, 7 Medford St. $10; $8 children and seniors. 781-646-4849, www.regenttheatre.com.
Waltham: Let’s Move Family Day, hosted by the Waltham YMCA and Let’s Move Waltham, will feature an afternoon of all-ages activities, including Zumba, karate, gymnastics, and Jump, Jiggle, and Jive sessions, swimming, and access to a climbing wall, from noon to 3 p.m. Saturday at the Waltham YMCA, 725 Lexington St. Free. 781-894-5295, www.healthywaltham.org.