The Festival of Endurance Hever Castle 2020 race starts Sunday, 5th July 2020. Event location UK, Hever. Due to popular demand the Gauntlet half iron distance triathlon is returning with athletes racing alongside the full iron distance Bastion competitors around much of the same course.  Whilst these two epic triathlons are taking place a further 6 sets of endurance challenge races are taking place including Aquabike, Aquathlon, Duarhtlon, Long Distance Running and Long Distance Swimming making this a true celebration of the art of “going long”.