Direct answer
Objectives follow journal display order. Some depend on your choices; follow the active objective in the game.
Result
When Geralt found out a fistfighting circuit was operating in Velen, he decided to test his strength and enter. You must know Velen bouts were remarkable for their dirty and no-holds-barred fighting, but to someone who fights monsters dirtily and leaves no holds untried on a daily basis, this was no worry.