The Tailwind Nutrition 3 Marathons in 3 Days event has many entry options, all run over the same course, but varying in distance and days. 2021 is the 10th year the 3M3D Grand Slam and Cairns Marathon is being held.
- 3M3D Grand Slam (126.6km), 9-11 July 2021. In its tenth year. A marathon is run each day over three consecutive days. Competitors can opt to compete in only one or two of the marathons, but the ‘Grand Slam’ medal goes only to those who complete all three marathons. NOTE: Entry fee for Marathon 1 and or Marathon 2 is the same as for the Grand Slam event.
- Cairns Marathon (42.2km), 11 July 2021. The Cairns Marathon is the same course as Marathon 3 of the 3M3D event.
- Fig Tree Half Marathon or 10km (21.1km), 10 July 2021.
- Lake Morris Road Race (16km), 11 July 2021. The route for this race is the same as the last 16km of the Cairns Marathon course. Walkers welcome.