The official opening of the Asian Games hasn't happened yet

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I know that for team ball sports, the group stage typically starts before the official opening ceremony...
But since the opening is on the 19th, it looks like basketball started the group stage almost two weeks early.
Since games were played last Thursday,
I thought the official opening was last Saturday... --a
It's already started, but there hasn't been any mention of an opening ceremony, so it felt too quiet, which is why I looked it up. --a