Hinamatsuri is a festival in Japan to celebrate the good health of girls. It’s celebrated by arranging dolls on a red carpet but the source of this celebration is actually a ceremony where 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 am, and will be canceled in case of rain.