The public is invited to hear four panelists discuss Dark Sky conservation efforts at the Winchester Book Gallery at 6 p.m. on April 7. Adam Layman, Staunton River State Park, “Dark Sky Certification”; Dane Toler, Shenandoah Astronomical Society, “Observing the Spring Sky”; Laura Greenleaf, International Dark Sky Association, “Light Pollution 101”; Patricia Rostkowski, volunteer, “Grassroots Volunteerism.” For more information call 540-667-3444.