Learn about “The Incredible Edible Oyster” in a virtual class via Lifetime Learning at Snow Library on Friday, April 30th, from 1:30 to 3 p.m. Ian Ives, director of Mass Audubon’s Long Pasture Wildlife Sanctuary, will discuss the history of these mollusks, as well as the threats they face. Registration is $10 at friendsofsnowlibrary.org.