The event involves 20 activities in 20 days in an effort to show how Los Angeles 2024 can contribute to Olympic Agenda 2020.

The campaign will include community events, sports demonstrations and important announcements and is designed to capture the imagination of the International Olympic Committee (IOC).

Each event will aim to demonstrate why the plan of Los Angeles 2024 is "not only aligned with Olympic Agenda 2020, but will help the IOC make tangible progress in its mission to safeguard the uniqueness of the Olympic Games and strengthen sport in society".

Agenda 2020 was introduced by IOC President Thomas Bach in December 2014 to try and make the world's biggest sporting event cheaper to stage and more attractive, while bolstering the credibility of the Olympic Movement.

Los Angeles 2024 began the campaign yesterday as Rio 2016 badminton Olympians Paula Obanana and Iris Wang and their American team-mates Kyle Emerick and Tuck Chan, played a match in front of hundreds of people at the observatory.

Recommendation 23 of the IOC's Agenda 2020 calls for engagement with communities, including youth and the general public.

Los Angeles 2024 claim the badminton match continues their ongoing work to "harness California's cultural and entertainment assets to foster an enduring connection to young people and create new Games enthusiasts".

Today marks the Summer Solstice in the Northern Hemisphere, the longest day of the year.

This ties in with "Follow The Sun", the slogan of Los Angeles 2024.

"LA 2024 is an invitation to the Olympic Movement to Follow The Sun to a bright future," said its chairman Casey Wasserman.

"So there is no better way to start our 20 day homage to the IOC's future-focused Olympic Agenda 2020 road-map than a Summer Solstice celebration on the year's longest day of sunshine.

"Throughout our bid, events like this have shown what an oasis of Olympic optimism we have here in Southern California.

"With minimal costs, we have been able to engage this community in a celebration of sport and the Olympic Movement.

"An LA Games in 2024 will harness the best of Californian culture, entertainment and optimistic spirit and help the IOC to engage young people and communities worldwide."

A proposal to award both the 2024 and 2028 Olympic and Paralympic Games to Los Angeles and Paris was "unanimously" approved by the IOC Executive Board in Lausanne earlier this month.

The Candidate City Briefing on July 11 and 12 has now been elevated to the level of an Extraordinary IOC Session, at which the wider membership will be expected to ratify this plan.

If the IOC members agree in principle, they will then begin a process to "speak, discuss and negotiate with bidding cities".

It is widely expected that this will end with Paris being awarded the 2024 edition and Los Angeles 2028.