After promoting his upcoming films Suburbicon and Downsizing at the Toronto International Film Festival last week, Matt Damon was in Boston Wednesday to highlight another project, an issue he said has been “at the forefront of our family and dinner table conversations my entire life.”

Damon, a Cambridge native, narrated Sarah Mondale’s film Backpack Full of Cash, a 2016 documentary about the movement to privatize public education. On Wednesday night, Damon joined Mondale, Backpack coproducer Vera Aronow, and his mother, Nancy Carlsson-Paige, an activist for early childhood education, for a screening and discussion of the film.

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