Karner Blue Butterfly Walk. A 0.9 mile hike.  Free! Reservations required for all attendees. Children under 18 must be accompanied by an adult. Make reservations by calling 518-456-0655 or visit www.AlbanyPineBush.org/events. 11:00 a.m. at Albany Pine Bush Discovery Center, 195 New Karner Road, Albany, NY.