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Bret Harte Elementary kindergarten to second grade teacher Kalina Francois pushes her daughter Inayah, 1, in a stroller while joining Bret Harte Elementary School teachers and Untied Educators of San Francisco members in a strike outside of Bret Harte Elementary School in San Francisco, Calif., Tuesday, Feb. 10, 2026. (Jessica Christian/San Francisco Chronicle via AP)

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Bret Harte Elementary Stacey Gonzalez TK teacher reads a United Educators of San Francisco newspaper as Bret Harte Elementary School teachers and Untied Educators of San Francisco members strike outside of Bret Harte Elementary School in San Francisco, Calif., Tuesday, Feb. 10, 2026. (Jessica Christian/San Francisco Chronicle via AP)

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The holiday with activist roots is celebrated on the first Monday of September, creating a three-day weekend that marks the unofficial end of summer.