It's the season to put out the O-Hina Sama.
From Wikipedia (the picture is from our house, though)
Hinamatsuri (雛祭り, Hina-matsuri), also called Doll's Day or Girls' Day, is a special day in Japan. Celebrated on 3March of each year, platforms covered with a red carpet-material are used to display a set of ornamental dolls (雛人形, hina-ningyō) representing the Emperor, Empress, attendants, and musicians in traditional court dress of the Heian period.