Political event
It is decided to ensure that scions go to a separate sector than where their birth parents live.
This is a fairly minor event, a natural conclusion of the continuing segregation practices of the Therrans. They are meant to remain separate from the normal population, and again this is an action to protect the parents. It's not an unexpected thing, but it starts to create unrest. Scions are starting to resent how "outside" they are kept from normal society. No one else gets dictated where they have to live. No one else is restricted in where they get to go to school, or which jobs they can have. (Not entirely true, but the computer does give a lot more choices to others, and these are based off aptitude rather than social status.)