21 August is the 233th day of the year (234th in leap years). There are 132 days remaining until the end of the year.
- (Unknown Year): Terry Boot's check-out of Quidditch Through the Ages from the Hogwarts Library ends.
Behind the scenes
- 1989: Robert Knox, who plays Marcus Belby in the film adaptation of Harry Potter and the Half-Blood Prince, is born.
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