Saint George's Day.

St George's Day is celebrated in England on 23 April, in honour of St George, the patron saint of England.

St. George is the patron saint of England. His symbol, a red cross on a white background, is the flag of England, and part of the British flag. St George was a brave Roman soldier who protested against the Romans' torture of Christians and died for his beliefs.
One of the best-known stories about Saint George is his fight with a dragon. Despite this, St George is known throughout the world as the dragon-slaying patron saint of England.