A free showing of the documentary “Screenagers: Growing Up in the Digital Age” is scheduled for 7:30 p.m. Sept. 27 at Landmark on Main Street, 232 Main St., Port Washington.

The documentary was made by Setauket mom Delaney Ruston, who is also a physician, when she was deciding when and whether to get her daughter a smartphone — and what the rules for its use should be. The film has been shown to parents and students at hundreds of schools, religious and community organizations, and other venues on Long Island and across the United States.

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A panel discussion and Q&A moderated by Dana Friedman, president of the Early Years Institute and member of the New York State Early Childhood Advisory Council, will follow the film. Panel members include Dr. Mary Ellen Renna, pediatrician and author of “10 Steps to Almost Perfect Parenting”; Christopher Shields, Weber Middle School principal; and Yael Sommer, a Port Washington Children’s Center social worker.

For more information, visit landmarkonmainstreet.org

“Screenagers” will be shown again on Sept. 29 at Harbor Country Day School, 17 Three Sisters Road in St. James. That showing, at 7 p.m., will cost $10 per person. Tickets can be purchased at harborcountrydayscreenagers.eventbrite.com.