ひな祭り (Hinamatsuri) is the Japanese Doll Festival or Girl’s Day celebrated on the 3rd of March. On this day, a platform is set up with dolls dressed representing the emperor, empress, attendants and musicians.
In the Sunshine Forest however, these little chicks have got it a bit mixed up. 雛 (Hina) in Japanese can mean both doll and chick. So these mixed-up birds thought that today was the festival of the chicks. How unfortunate!
But they did get the concept right at least . . . well, most of them anyway.
*Note: The Empress chick was eating Sakura Mochi; a common food to eat during Hinamatsuri.