City of Hyattsville will hold its Grassroots Expo spearheaded by Hyattsville’s Department of Public Works and supported by the Hyattsville Environment Committee. It will focus on “stormwater management and conservation landscapes. FREE

At 1 p.m. Thomas Rainer, coauthor of Planting in a Post Wild World, will speak about designing landscapes and gardens that provide ecological benefits while satisfying our craving for beauty and nature.