3 December is the 337th day of the year (338th in leap years). There are 28 days remaining.
- 1926: Volume 109 of the American magazine U Hex A! is published.
- 1926: The Circus Arcanus stages two shows in New York.
- 1992: Hermione Granger continues brewing Polyjuice Potion in Moaning Myrtle's Bathroom
- 1995: Ron Weasley and Hermione's prefect duties become more onerous: they must supervise castle decoration, patrol the corridors at night and supervise first and second years on their breaks.