The Doll Festival, also known as Hina Matsuri is an annual event in Japan to celebrate the good health of girls.
It’s typically celebrated by arranging dolls on a red carpet. However the source of this celebration is actually a ceremony in which people floated dolls on boats down rivers to carry bad luck away. This custom is continued in Sumida Park on the Asakusa side of the river near Azumabashi bridge. The ceremony starts at 11:30 a.m., and will be canceled in case of rain.