Things To DoDearne Valley Triathlon and QuadrathonBy Antony ClayPublished 15th May 2018, 14:15 BSTUpdated 15th May 2018, 14:16 BST At Manvers Lake on June 10. Triathlon – swim, bike and run – Sprint, 800m swim 15K bike, 5K run; start time 9.30am, price £30.