31 May is the 151st day of the year (152nd in leap years). There are 214 days remaining until the end of the year.
- 1999: A riot takes place over a meeting between Ministry of Magic officials and the Brotherhood of Goblins in order to discuss a Goblin Bill of Rights.
Behind the scenes
- 2004: The film adaptation of Harry Potter and the Prisoner of Azkaban is released in Great Britain.