Events The Chiltern 50 Challenge The Chiltern Challenge is a 50km looped route, with over 900 metres to climb, across the beautiful Chilterns countryside, starting and finishing at Henley Showground. There's a Saturday night celebration and barbeque, with extensive on-site camping and parking options. All participants who enter will receive a medal and t-shirt. Participants who do not wish to complete the full course can register for the 25km route, by clicking here To speak to a member of the charity about this event, please call 01865 743 444 or email [email protected] If you fancy a challenge or would like more information, please do check out the Ultra Challenge website, using the button below.