The triathlon – a 2.4-mile swim, a 112-mile bicycle ride and a full marathon – will bring 2,500 competitors plus their families and supporters, as well as up to 2,500 volunteers and thousands of spectators to the Callaghan Valley, Whistler and Pemberton areas. The August 25 race day begins at 6:30 a.m. and ends at midnight and race day preparations will begin as early as 4:00 a.m.