King’s Birthday in UK
King’s Birthday in UK is held on June 13. Since 1974, the Queen’s official birthday has been celebrated on Saturday in the range between June 11 and 17. A military parade known as Trooping the Colour is held in London and is attended by the Royal Family. This event in the second decade of the month June is annual. 
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Queen Elizabeth II's birthday is on the 21st of April 1926. The Queen's April birthday is a private affair that she spends with her family. The occasion is marked with 21 gun salutes in Windsor Great Park, 62 gun salutes at the Tower of London and 41 gun salutes in Hyde Park.
Similar holidays and events, festivals and interesting facts
Lindisfarne Day on June 8 (in memory of the Viking raid on the tidal island of Lindisfarne on the northeastern coast of England in 793, which marked the beginning of the Viking era in Northern Europe);
International Yarn Bombing Day on June 13 (second Saturday in June);
Liberation Day in Falkland Islands and South Georgia and the South Sandwich Islands on June 14
National Beer Day in United Kingdom on June 15
Magna Carta Day in Britain on June 15
International Cleaners Day on June 15
Sussex Day on June 16 (The event takes place on St Richard's Day, the feast day of St Richard of Chichester, Sussex's patron saint)