Saturday - Eighth Annual Gull Frolic at the Winthrop HarborYacht Club at North Point Marina. Registration begins at 8 a.m. Thanks to the Chicago Ornithological Society, this year's speaker will be British born, Texas-based Martin Reid -- "The Herring Gull Complex: Demystifying the Sub-species". The $10 registration fee helps defray facility expenses and includes continental breakfast, lunch and hot drinks all day.