Freshmen joining a school group called the shifters undergo a week-long initiation involving learning the group's history, wearing group-specific items, and participating in special ceremonies that last all night long. this experience most resembles:

I believe the answer is: Rite of passage

Rite of passage refers to some sort of ritual that conducted before an individual enter a certain social group. (i.e: freshmen entering new schools).The rite of passage would be filled with a set of traditions that must be followed by all new members before being accepted by other people in the group.

your answer is "graduates" hope this

quote is the answer your looking for.