Dragon Boat races take place over the two weekends from early June—the anniversary of the opening of Yokohama Park. The final Sunday is the day of the International Champions Cup race in which 15 teams are expected to participate. The best place to see the action is from the seaside path of Yamashita Park where there will also be stage events and booths selling food and drink. The Dragon Boat race is part of the wider Yokohama Port Festival that takes place over the same weekend.
Event details are taken from official sources whenever possible. It is always prudent to check the official event website before attending to make sure that there have not been any changes. If you know of an error in the calendar, then please let me know through the contact form.