Homeless people will have the chance to see a doctor or dentist, seek housing and benefits advice and even get a haircut this Christmas.
The services, provided by national charity Crisis, will be offered at the London Arena from 23-30 December.
Mick Bateman, of Crisis, said the event would "inspire" homeless people to rebuild their lives.
The charity estimates there are about 380,000 'hidden' homeless people living in Britain.
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