Hamamatsu Festival (浜松まつり) is a festival held in Hamamatsu, Shizuoka Prefecture, Japan, on May 3 to 5 every year. The Hamamatsu festival is not a religious festival but a city festival. In Japan, May 3 to 5 is a holiday called Golden week. Golden week is the longest national holiday in Japan. May 3 is Constitution Memorial Day, May 4 is Greenery Day, and May 5 is Children's Day. During the festival, people who live in each ward celebrate children, especially baby boys, and local restaurants pray for success and prosperity.