We celebrate Christmas and Easter and that Jesus bloke could never be arsed to come over here either.
A large portion of the world celebrate those. They're not unique days to celebrate 'Englishness'.
"In later centuries, Edward III’s kingship came to be seen as the epitome of how a medieval king should rule, and St George – the king’s patron saint – came to symbolise both his great kingship and the national pride that went with it. After the battle of Agincourt, the saint’s day (23 April) was made a major feast day – a national holiday – and it remained so until the mid-sixteenth century. That is why, throughout the Wars of the Roses, St George acted as a unifying figure, a patron saint to both Lancastrians and Yorkists. Similarly, this association with great kingship and national pride meant that St George was one of the few saints who continued to have relevance in England after the Reformation. Only in the last two centuries – when the English nation has been somewhat submerged in the larger entities of the United Kingdom and the British Empire – has St George lost this connection, with his flag now being more significant than the saint himself, as the most potent icon of English identity."
And all that applies to Georgia, Egypt, Bulgaria, Aragon, Catalonia, Romania, Ethiopia, Greece, India, Iraq, Israel, Lebanon, Lithuania, Palestine, Portugal, Serbia, Macedonia, Ukraine, Russia, Syria, Genoa, Amersfoort, Beirut, Botoşani, Drobeta Turnu-Severin, Timişoara, Fakiha, Bteghrine, Cáceres, Ferrara, Freiburg im Breisgau, Kragujevac, Kumanovo, Ljubljana, Pérouges, Pomorie, Preston, Qormi, Rio de Janeiro, Lydda, Lviv, Barcelona, Moscow and Victoria does it?