Yemassee Shrimp Festival River Run: 9 a.m.-3 p.m., starting points are at Tea Room, Twickenham, Public Landing, Longreach Sandbar, and Steelbridge; $10 entry fee; 843-589-2120, www.yemassee.net
Old Saint Bartholomew Genealogy Society Chapter meeting: 3 p.m., Research Center, 609 Black St., Walterboro; a vote to accept or reject the chapter's new bylaws will be taken; President Bob Williams will give a presentation about Vietnam and 9/11; free; 843-524-4919, firstname.lastname@example.org
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Spaghetti dinner fundraiser for 3-year-old Morgan Porter, who is awaiting a heart transplant: 6-9 p.m., Cat Island Grill and Pub, 8 Waveland Ave., Beaufort; $10; 843-524-4653
National Association on Mental Illness presentation: 7 p.m., LowCountry Presbyterian Church fellowship hall, 10 Simmonsville Road, Bluffton; Joy Lauerer, nursing professor at the University of South Carolina Beaufort will discuss "New Treatment Options in Mental Health"; 843-681-2200
Dee Merian author talk: 1 p.m. Hilton Head Library, 11 Beach City Road, Hilton Head Island; local author discusses the golden years of the airline industry from her book, "The Best Years of Flying;" 843-255-6525
Hilton Head for Peace meeting: 7 p.m., Palmetto Electric Building, 111 Mathews Dr., Hilton Head Island; Dr. Julius Scott discusses "The Continuing Significance of Nonviolence in the Struggle for Peace and Justice"; 603-264-6102