Mystery of the Brown House

 a the main questline of the Not Yet Spring Cleaning 2019 Event, released on January 9, 2019. Progressing through it all of the event's personal prizes. It preceded by a short quest intro What Makes a Home.

End
Unlocks Ms. Glick's House.

End
Unlocks the Springfield University.

End
Unlocks Alice Glick.

End
Unlocks the Original Brown House.

End
Unlocks Have a Knitting Circle animated job.