Channel 4 and Big Brother 8 will also back the work that Samaritans does providing emotional support to distressed people.
Alex Hamilton, the film and theatre actor who appeared in the film Wimbledon, is also supporting the fundraising drive. She contacted Samaritans as a teenager when she was bullied at school while studying for her A levels, suffering broken bones as a result. A fundraising target has not been announced, but 7.7 million viewers watched the final last year.
The Wallace & Gromit Children's Foundation has begun a nationwide tour of hospitals and hospices to hand out £100,000 to sick children and encourage a million Britons to take part in Wrong Trousers Day on 29 June. About 250,000 people have already signed up to pay £1 each to wear casual trousers for the day. The foundation will hold a national competition to find people with the most ridiculous trousers. The winners will be selected in an online vote.
Tony Blair will launch the annual Alexandra Rose Flag Day by buying a rose on the steps of 10 Downing Street on 19 June. The charity's partners will hold fundraising days from 16 June onwards.
Crash, the construction and property industry charity for homeless people, raised £9,000 from its Red Friday fundraiser last month. Construction sites and offices were decorated in red to spread awareness and raise cash.