This is what we found on Wikipedia regarding the Down Under CrossFit Championship:

The CrossFit Games is an annual athletic competition owned and operated by CrossFit, LLC. Athletes compete in a series of events at the Games, which may be various standard CrossFit workouts consisting of metabolic conditioning exercises, weightlifting, and gymnastics movements, as well as a range of activities from other sports such as swimming, road cycling and strongman. The events generally are not revealed before the Games, can include unexpected elements to challenge the athletes' readiness to compete, and they are designed to test the athletes' fitness using CrossFit's own criteria. Winners of the CrossFit Games earn cash prizes and the title of "Fittest on Earth."

The competition started in 2007 and has been held every year since, normally in the summer. The first competition was held at a ranch in Aromas, California, with small groups of participants and spectators, but the CrossFit Games rapidly grew, and within a few years, the competition was moved to larger venues at the Home Depot Center in Carson, California, followed by the Alliant Energy Center in Madison, Wisconsin. It was held in the Dickies Arena in Fort Worth, Texas in 2024. The Games were sponsored by Reebok from 2011 to 2020, and by Nobull from 2021 to 2023.

The CrossFit Games season consists of four stages; the first qualification stage, the Open, is billed as the largest participatory sporting event in the world, with over 415,000 athletes signing up to compete in 2018. The number of participants are reduced in two more qualification stages, the quarterfinals and semifinals, to 40 men, 40 women and 40 teams to compete at the CrossFit Games. A few athletes have dominated in the Games' history; they are Rich Froning (four wins) and Mat Fraser (five wins) in the men's competition, and Tia-Clair Toomey (seven wins) in the women's.