Karner Blue Butterfly Walk. 1 to 2:30 p.m. Don’t miss this chance to join Albany Pine Bush Preserve staff on a 0.9-mile hike. Come learn about the natural history of the Karner blue and our efforts to rescue this species from the brink of extinction. All ages. Albany Pine Bush Discovery Center, 195 New Karner Road, Albany. $3 per person/$5 per family/Children under 5 yrs free. Registration required. 518-456-0655 or visit www.AlbanyPineBush.org/events.