What is the name of a floating festival held annually on the shores of Lake Ontario?

The Toronto International Boat Show is indeed a well-known annual event, celebrated on the shores of Lake Ontario. It showcases an array of boats, marine products, and related activities, making it a significant occasion for boating enthusiasts and the marine industry. The show often features interactive displays, educational seminars, and even on-water demonstrations, providing visitors with insights into boating culture and lifestyle.

The other options, while they may represent various events or festivities, do not specifically focus on a floating festival with the same prominence or reputation. Ontario Summer Fest could refer to a seasonal celebration in the region but does not exclusively highlight boating. The Lake Ontario Music Festival might suggest a musical event but lacks the emphasis on maritime aspects. The Canadian Boat Parade could involve boats but does not carry the same level of recognition or recurring annual commitment as the Toronto International Boat Show. Thus, the Toronto International Boat Show stands out as the primary floating festival associated with Lake Ontario.