NASA Eclipse Education - this website from NASA has educational materials about the eclipse and the sun, and information on viewing the eclipse with children safely.
Fraknoi, Andrew and Schatz, Dennis, 2017. An Observers Guide to Viewing the Eclipse: All-American Total Solar Eclipse. Insert to the book Solar Science: Exploring Sunspots, Seasons, Eclipses, and More. National Science Teachers Association.
American Astronomical Society Eclipse Education - The American Astronomical Society has a page of links to educational resources about eclipses including classroom activities, information about books and educational videos from a number of different sources.
Eclipse Resources from Multiverse at UC Berkeley - UC Berkeley's Space Sciences Laboratory provides educational opportunities and resources for a variety of audiences. Their website provides links to other eclipse education resources, including articles on the eclipse that have appeared in journals published by the National Science Teacher Association (NSTA). The articles address eclipse education for various grade levels.
National Solar Observatory Educator Resources - the National Solar Observatory website has a series of educational resources on the eclipse that are organized by grade level.