The 40th Annual Harefield Fun Run and Family Day in aid of Harefield Hospital Donate Fundraise Our biggest event just got bigger! We’re incredibly excited to be celebrating the Fun Run’s 40th birthday! It will be our biggest event yet, and we can’t wait to celebrate this incredible milestone with you! An important day for an important cause We’re holding this special celebration of Harefield Hospital to raise funds for the amazing work of the hospital and its staff. Harefield is a world leading centre for the treatment of heart and lung disease and performs thousands of life saving procedures each year. Everything raised at the Fun Run will go towards helping the patients that Harefield treats. Get fun running The Fun Run consists of a 4-mile walk, jog or run around the beautiful Harefield countryside followed by an afternoon of food, music, games and stalls in the grounds of the hospital. There is something for the whole family. Manage Cookie Preferences