9 December is the 343rd day of the year (344th in leap years). There are 22 days remaining until the end of the year.
- 1991: Professor Minerva McGonagall takes names of the students who decided to stay at Hogwarts Castle over the Christmas holidays.
- 1992: Hermione Granger continues brewing Polyjuice Potion in the second-floor girls' lavatory.
- 9 December on Wikipedia