Bill Turnbull, who presents the Breakfast News programme, is to kick off proceedings at this year's Goodnight Walk for the charity Iain Rennie Hospice at Home.
Taking place on June 19th 2010, the event will see up to 1,100 people walk eight miles around Amersham and Little Chalfont from midnight onwards.
It is also hoped that a world record will be broken for the longest-ever fancy dress conga line - and this year's theme is carnival or Mardi Gras.
"I urge people to get involved as every penny raised makes a tremendous difference to families across the Chilterns," said Bill.
Should you wish to take part, you could choose from an array of Hawaiian grass skirts and garlands.
Alternatively, you could look at the carnival theme in a different way and go for a Fortune Teller fancy dress costume just like the one in the '80s film Big!