St Bartholomew's Day
From Tardis Wiki, the free Doctor Who reference
St Bartholomew's Day was an annual event celebrated in Auguston Earth. (PROSE: A History of Humankind)
On St Bartholomew's Day in 1459, Vlad the Impaler had 30,000 people murdered by impalation on spikes at Brasov. (PROSE: The Book of the War)
The St Bartholomew's Day massacre occurred on this day in 1572. (TV: The Massacre)