The Queen will be joined by the likes of the President of America, Prime Ministers from Commonwealth nations and many more. Here are the faces of those who are attending the event at Southsea Common on Wednesday.
1. United Kingdom
Queen Elizabeth II is coming to Portsmouth Photo: John Walton
2. United Kingdom
The Prince of Wales is attending the ceremony in Portsmouth Photo: Ben Birchall
3. United Kingdom
Theresa May will attend the ceremony as one of her last acts as Prime Minister Photo: Daniel Leal-Olivas
4. United Kingdom
Labour leader Jeremy Corbyn will attend the ceremony in Portsmouth despite reports he would snub it. Photo: Danny Lawson