Author and sustainability champion David W. Orr gives the keynote address at this year’s Sustainability Day, presented by Sonoma State University. More than a traditional conference of talk, this event walks the walk, showcasing several student projects and fieldwork, as well as giving a call to action in their “Do One Thing Today” theme. Orr’s talk will look at our climate crisis and what role students and colleges need to take on to help preserve the planet. Several other speakers, panels, art exhibits, live music and sustainable activities are on tap, and it’s all open to the public on Wednesday, Oct. 21, at Sonoma State University, 1801 E. Cotati Ave., Rohnert Park. 9am. Free. www.sonoma.edu.