Learn about the Paragon Carousel and others like it in a free lecture by author Richard Gardner at the Red Parrot at 4 p.m. Sunday. Gardner’s new book, “The History of the Legendary Philadelphia Toboggan Company Carousels,” includes the Hull landmark ride, one of only 35 carousels made by the company still in operation, according to the Friends of the Paragon Carousel. More information is available by contacting info@paragoncarousel.com or 781-925-0472. The Red Parrot is located at 1 Hull Shore Drive across from Nantasket Beach.