Only the monarch has the power to make a day into a national holiday, although following convention this is only done on the advice of government ministers.
King Charles has to issue a Royal Proclamation to either change the date of a bank holiday or create a new one.
What are you meant to do on St George's day?
Celebrations have diminished over the centuries, although some parades and public activities still take place every year.
We commemorate the day by partaking in any English customs such as fetes and Morris dance.
It is traditional for Christian churches to commemorate Saint George on his feast day, or on the nearest Sunday.
This is often done with he singing of the traditional hymn Jerusalem.
Many pubs and houses are decorated with England's flag, much like when major sporting events are on.
The Feast of St George takes place in Trafalgar Square, London, every year, filled with food, music, and market stalls.
There are even the odd Punch & Judy show and town crier contests.
A feast featuring traditional fare is also held in many parts of England, and some regions organise theatre performances that include jousting and reenactments.
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The Feast of St George is a modern celebration of St George’s Day, held in London’s Trafalgar SquareCredit: Getty
How did Saint George become the saint of England?
St George is thought to have been a soldier somewhere in the eastern Roman Empire, modern-day Turkey.
According to the Golden Legend - a popular collection of saints’ lives written in the 13th century - he was a hero knight who slayed a dragon.
The legend tells a story of a town in Libya which was terrorised by a dragon.
To appease the monster, townspeople offered it two sheep a day.
When the town ran out of sheep, the king devised a lottery system to feed the hungry dragon local children instead.
But, one day his own daughter was chosen and as she was being led down to the lake, heroic Saint George happened to ride past.
The story says that George offered to slay the dragon but only if the people converted to Christianity.
They did, and the king later built a church where the dragon was slain.