People in Mansfield can take part in a campaign by a children’s hospice to create the world’s biggest rainbow on Wednesday at White Post Farm, Farnsfield.

Rainbows Hospice for Children and Young People, which cares for children from Nottinghamshire with terminal and life-limiting illnesses, wants people to celebrate its 20th birthday milestone by helping to smash a world record. To get involved, people can share a bright photo selfie online or write a birthday message on a special coloured postcard.

Later in the year, the selfies and postcards will be laid together to create the giant rainbow. The charity hopes to break the record for the world’s biggest postcard mosaic, which currently measures 453.37 m² and was created by students from The Camford International School in India.

A special roadshow is touring the East Midlands and on Wednesday it will be at the farm, in Mansfield Road, from 10am until 3pm. People in Nottinghamshire are invited to go along, choose from an array of props and take a coloured selfie or write a birthday message on a special postcard.

The campaign is supported by Juice Creative and Smooth FM. To join in, share a bright photo of yourself using backgrounds or accessories matching one of our special rainbow colours – red, orange, yellow, green, blue, purple or pink. Then, using the hashtag #RainbowsSelfie, post it onto Twitter or Facebook, making the image public, and nominate your friends. Or visit www.rainbows.co.uk/birthdayrainbow to order coloured postcards.