Who: Anyone with access to the Slytherin common room. What: Random interaction in the Slytherin common room just because they can. (And because Britt is bored!) When: November 1976. Where: Slytherin common room.
Who: Andromeda Black, Thomas Nott Where: 7th year boys' dormitory When: November '76, post-Death Eater meeting What: Thomas uses Andi's cat as a not-completely-pathetic excuse to see her after being summoned by Voldemort for a meeting.
Who: All Slytherin Students. Where: Slytherin Common Room. When: Sometime after supper. Summary: Thomas sets up the common room and send out reminders for a bloody Slytherin party (that Angie conned him into throwing).