You may also be looking for the comic book entitled "Class Reunion"

A class reunion is a planned event at which members of a past school class meet.

In 2370, Counselor Deanna Troi visited Starbase 231 for her class reunion. (TNG: "Thine Own Self")

In 2375, Captain Kathryn Janeway joked about having a 'class reunion' with the members of Species 8472 who had taken the form of Starfleet officers and cadets on Terrasphere 8, as a way of ending hostilities. (VOY: "In the Flesh")