School or Class photos can be done anytime, not just at Graduations or set times during the year. And there not just limited to a standard backdrop or setting. Class photos can be done when your child is into and passionate about something; and should reflect a portion of their personality.
Portraits taken with fellow alumni whether it be at a Class Reunion, your child's graduation from the same school you went to, or even at the retirement event of your favorite teacher. They are a momento to keep and a new portrait is a great thing to share with them and others.