Supporters of the centre, in Croft Avenue, Southwick, can join in the abseil feat to help people with neurological conditions.
The abseil down Peace-haven Heights on August 31 will raise funds for vital services and treatments, and provide support to hundreds of people across Sussex. Places are available to anyone aged over eight.
Deputy manager Joanna Hedges said: “This event is a great fundraiser for the Sussex MS Treatment Centre, with up to 50 people taking part and abseiling down the cliffs on the day.
“Family and friends are encouraged to sign up for this great outdoor challenge.
“It is only £25 to register for a place and we ask you to aim to raise at least £100 sponsorship to help us fundraise for the Sussex MS Treatment Centre.”
Call the centre on 01273 594484 or email [email protected] for a registration pack.