Illinois Ornithological Society presents the Annual Gull Frolic. 9:30 am, at the Winthrop Harbor Yacht Club, 301 North Point Drive Winthrop Harbor, IL 60096. ENSBC has been a supporter since its inception and will have a display booth.  The featured speaker will be Amar Ayyash, author of the brand new "The Gulld Guide:  North America." For more information and tickets, click here:  23rd IOS Gull Frolic - 2025 Tickets, Sun, Feb 16, 2025 at 9:30 AM | Eventbrite