It’s being hosted by the Ahmadiyya Muslim Community which is based at the Baitul Futuh Mosque in Morden.
The Jalsa Salana will bring together 35,000 people from over 100 countries with the aim of promoting religious peace.
Fareed Ahmad from the Ahmadiyya Association says it’s a remarkable event.
The Jalsa Salana takes place from the 26th to the 28th of July at Oaklands Farm in Hampshire and will be broadcast globally.