J.M. Tull-Gwinnett YMCA and Robert D. Fowler YMCA will be Gwinnett County’s official host locations Thursday for “The World’s Largest Swimming Lesson,” a simultaneous swimming event meant to teach children around the world how to swim.

The event will start at 11 a.m. at the Lawrenceville and Norcross area YMCA pools, but YMCA membership is not require to participate in this free event.

Information: www.wlsl.org.