The Royal Family will attend Platinum Jubilee celebrations across the UK in the coming hours - although the Queen will miss her second event of the weekend celebrating the 70th anniversary of her reign as Britain's longest-service monarch.
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Buckingham Palace said the monarch has pulled out of the Epsom Derby and will instead watch it on television.
The third day of celebrations will include tributes from the Prince of Wales and Duke of Cambridge at an open-air concert on Saturday evening local time.
The 96-year-old has had mobility problems and pulled out of the thanksgiving service after experiencing "discomfort" the day before.
The Queen was to attend Saturday's iconic horse race, but her daughter Anne is expected to represent her instead.