There’s a whole slew of lectures and classes coming up that folks might be interested in at the Arnold Arboretum, include a free Director Lecture series in which “nationally recognized experts examine an array of contemporary topics related to Earth’s biodiversity and evolutionary history, the environment, conservation biology, and key social issues associated with current science. Opportunities to chat with the speaker follow each lecture. Lectures are free, but registration is required. All lectures held in the Hunnewell Building, Arnold Arboretum.” Also of possible interest – workshops on grafting and home garden design. Check their calendar for details, as well as the full list of events. Arnold Arboretum Calendar