VThree Chai Cancer Care supporters have committed to raise £100,000 by getting their friends to host money-making events.
Natalie Chester, Emma Myers and Laura Avigdori launched Chai Promise at a reception in the new Wohl wing of the charity's Hendon premises.
The idea is that as well as making a donation to attend a Chai Promise function, guests will pledge to host their own event. Twenty people have already committed to holding a fundraiser. The money will go to Chai's children and family support service.