The Clan Games will begin once the War League ends. Since the League ending/CG start will happen before the next wave of Season Challenges will unlock, we decided to release the Clan Games task earlier instead of after the CG start. If the CG points task started after the CG itself began, then there'd be more complaints that there wasn't enough time to complete them.
So having the task show up early was intentional.

오늘 챌린지항목에 클랜게임 관련된 도전과제가 있어서
포럼보다가 알게되었습니다