A pair of Peruvian llamas will be the guests of honour at a west London party to launch a grandmother's fundraising trek along the Inca trail.
Laelia Hartnoll, 60, hopes to raise more than £12,000 for Great Ormond Street Hospital (GOSH), which saved her daughter's life 37 years ago.
When she was only 14 days old Emma was taken to hospital with acute septicaemia, before being referred to the mother and baby unit at Great Ormond Street.
After spending two weeks in the unit she made a full recovery and is now a healthy mother of five-year-old twins.
'Swap boots for bus'
"If she hadn't been cared for by the hospital I know she wouldn't be with us now," said Mrs Hartnoll.
"I have always wanted to do something in return for Great Ormond Street."
The 60-year-old from Westbourne Grove, west London, will set off on the GOSH Inca trek on 14 May.
Mrs Hartnoll said: "When I get back I am going to swap my trekking boots for a bus pass!"
The party is from 1230 BST to 1900 BST on Sunday in Westbourne Grove.