Tens of thousands of people are expected to descend on London's Hyde Park on Saturday for what's being described as an inspiring and exciting day of free activity to shake the G8, who are meeting in Northern Ireland later this month, into action on hunger.
Guests in London for the Big IF event are expected to include musicians, dance acts, former Archbishop of Canterbury Dr Rowan Williams, Bill Gates, Natasha Kaplinsky, and celebrity hosts Myleene Klass and Gethin Jones.
Comedian Eddie Izzard and footballer David Beckham have recorded video messages of support to be broadcast on big screens.
Before the rally, the day begins with an ecumenical service at Westminster Central Hall at 11.30am with the Archbishop of Westminster, Vincent Nichols giving the address.
It will be followed with a walk through central London from Westminster to Hyde Park in solidarity with the one in eight people around the world who go hungry.
At Hyde Park, supporters are being urged to sign an online petition, but also to share photos of themselves for beaming across the park and the web.
They can also share their Twitter or Facebook profile pictures online, to be shown on big screens in Hyde Park.
The event is organised by a coalition of charities including Oxfam, Christian Aid and Tearfund, which is calling on world leaders to end world hunger and stop tax dodging.
Loretta Minghella - Director of Christian Aid tells Premier's Des Busteed what she's hoping it'll achieve:
Participants are expected to build a field of flowers, with 2 million petals representing the 2 million children that die from hunger every year.
On the same day Prime Minister David Cameron will host an international Hunger Summit in London.
John McBride is a supporter of Catholic aid charity CAFOD and will be taking part in tomorrow's rally.
He tells Premier's News Hour he's confident the politicians will listen:
Enniskillen will be the first G8 meeting staged in Britain since the Gleneagles summit in 2005, which promised to 'Make Poverty History'.
One of the pledges back then was for countries to spend 0.7 per cent of national income on aid.
But while Britain will hit the 0.7 per cent target this year, France has only managed 0.42 per cent, the US 0.2 per cent, and Italy and Japan 0.17 per cent apiece.
The World Summit on Food Security in 2009 reiterated previous promises to halve hunger by 2015, compared to 1990 levels.
Yet the target looks like being missed, with the number of hungry people in Africa actually rising by 36 per cent, from 175million to 239million.