Fears that a change of mayor could affect the third Simcha On The Square event dissipated quickly in May when the event was agreed with Boris Johnson's office.
Now the celebration of Jewish life, music and culture on Sunday, September 14, looks set to be the biggest yet, with more of everything - food stalls, crafts, books and artists providing live music in London's Trafalgar Square.
Last year, the event attracted 25,000 people, making it the biggest one-day festival of Jewish culture in the UK.
Organiser Geraldine Auerbach said: "We had dates booked in before the mayoral election. Then we had to let the new régime settle in. We could not take it for granted so we were delighted when we knew we could go ahead."
The free event will be opened by Munira Mirza, head of cultural policy at the Greater London Authority, and Jonathan Metliss, chair of the Jewish Music Institute (JMI), after a shofar blast.
The day is organised by JMI on behalf of Jewish Culture UK, and is supported by the Greater London Authority, the European Day of Jewish Culture and Heritage, the London Jewish Forum and many Jewish culture groups.