April 19: HALLOWELL, Sumner Webber will speak on “Historic Hallowell,” at 7 p.m. at the Harlow Gallery, 160 Water St. Free 622-3813

April 19: PORTLAND, Theo Holtwijk, co-editor of “Bold Vision: The Development of the Parks of Portland, Maine,” will speak on “Mapping the City: Space, Place and Time,” at 6:30 p.m. at USM Glickman Family Library, 314 Forest Ave. 780-4850

April 20: BETHEL, wildlife photographer and author, Jennifer Loomis, will speak about bluebirds at 7 p.m. at Gould Academy McLaughlin Science Center. 824-3806

April 20: PORTLAND, author Christine Ellen Young will speak at noon at Portland Public Library, 5 Monument Square. Free 871-1710

April 21: ORONO, Malcolm Collins, Prof. Martha McNamara, Jennifer Jones and Sara Martin will speak on “The University of Maine’s Historic Preservation Master Plan,” at 5 p.m. at UMO Maine Center for the Arts. Free 581-3571

April 27: PORTLAND, author Masha Hamilton will speak at noon at Portland Public Library, 5 Monument Square. Free 871-1710

April 28: LEWISTON, Thomas Moore, psychotherapist, writer and lecturer, will speak on “The Soul of the University,” at 7 p.m. at L-A College, 51 Westminster St. 753-6560