Queen Elizabeth II will celebrate her 90th birthday on April 21. She will be joined by the entire nation as she marks the milestone. She will have dinner with her family for her real birthday this month. Festivities will be held across the country this summer encouraging the public to participate.

Elizabeth’s official birthday will be celebrated with fanfare all over the country in June. The Queen’s Birthday Parade will be held at St Paul’s Cathedral at St Paul’s Cathedral. She will be joined by her husband Prince Philip, the Duke of Edinburgh, Prince William and his wife Kate Middleton, Prince Harry.

The 89-year-old royal’s official birthday weekend will kick off June 10, which is also Prince Philips birthday. The next day will be the Trooping the Color, where Prince George and Princess Charlotte are expected to join. On June 12, there will be a huge street party and Patron’s Lunch at the Mall, where around 10,000 guests have been invited to join.

During the birthday weekend, communities all over the country have been encouraged to throw street parties in honor of the queen. On the morning of her 90th birthday, the queen will visit Windsor town centre. During her visit, crowds of people are expected to gather to pass on their well-wishes and wish her happy birthday.

The British monarch’s birthday is often marked on a day other than their actual birthday. And this applies especially when the sovereign’s birthday does not land in the summer months. The reason, in typical British fashion, comes down to the weather.

Buckingham Palace has shared a short video on its official Twitter, showing little Elizabeth playing with her sister.

In addition, Elizabeth has been the ruling monarch of Britain for over 64 years. She was never supposed to become the queen, but when her uncle Edward VIII was abdicated in 1936 in order to marry American divorcee Wallis Simpson, Elizabeth took over the British throne.

Meanwhile, in another related development, Windsor Castle and the Palace of Holyroodhouse will undergo an impressive 37 million (over $52 million) refurbishment over the next few years.

For the first time, visitors to the royal residences will be welcomed into the castle through the original entrance hall which has previously only used for heads of states and the queen’s official visitors. They will also get access to new areas, including medieval ones, to give visitors a true sense of how old the castle is.