Author Letty Cottin Pogrebin discusses her new book, "How to...

Author Letty Cottin Pogrebin discusses her new book, "How to Be a Friend to a Friend Who's Sick," in East Hills. Credit: Mike Lovett

Long Island author Henry Clark talks about his middle-grade novel, "What We Found in the Sofa and How It Saved the World" (Little, Brown Books for Young Readers). At 7 p.m., Sachem Library, 150 Holbrook Rd., Holbrook; 631-588-5024, sachemlibrary.org

Sag Harbor author Mac Griswold discusses her book "The Manor: Three Centuries at a Slave Plantation on Long Island" (FSG). At 1 p.m., Bryant Library, 2 Paper Mill Rd., Roslyn; 516-621-2240, bryantlibrary.org

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