Shichi-Go-San (七五三) is a milestone event that celebrates the health and well-being of three, five, and seven year old children. Traditionally, three-year-old boys and girls, five-year-old boys, and seven-year-old girls celebrate this event, however many parents nowadays will get all their children dressed up in kimono at the same time regardless of how old they are to get family photos. The children get dressed in kimono, take photos, and visit shinto shrines. The actual date of shichi-go-san is November 15, but children often get dressed up and take photos in the month before this date.
For more information on how to dress a child for shichi-go-san, click here.