The free event is organised in association with the Eid Committee – a voluntary organisation made up of representatives from various Muslim groups in London. It will take place on 17 August and marks the end of Ramadan - the holy month of fasting for Muslims.
For the first time, the event will include a food festival, giving people from all communities and faiths the chance to try delicacies from countries across the Islamic world, such as Turkey, Lebanon and Morocco.
As well as exhibitors and activities for children, entertainment will be provided on a main stage by artists including Adam Ali, Suhail Ahmed and Saif Adam.
Mayor Boris Johnson said: "Muslims in London and across the world are fasting for the blessed month of Ramadan and spending time in prayer and contemplation.
"When it ends, comes a time of happiness and celebration, as well as forgiveness and unity. I hope that Londoners from all communities will take the opportunity to join our festivities in Trafalgar Square."
Comment below to let us know what you think.
For more in-depth and print-only features, showcases and interviews with world-leading brands, don't miss the next issue of Event magazine by