Apple tested the live broadcast on its official Youtube channel. The picture of WWDC20 was used as the cover and the title was TEST, but the listed date was September 10, 2020 (Thursday), and it was quickly deleted afterwards. I believe that Apple will rarely broadcast live broadcasts casually. The live broadcast in September must be the iPhone conference. Will September 10 be the real date?
Note that Apple's iPhone conference last year was also on September 10, but it was Tuesday. And many people have also found that Apple often chooses Tuesday as the iPhone conference, because they want to have enough time to make reservations on Friday. If you choose September 10, 2020, it will be held on Thursday, which is different from the past.
The market expects that Apple will postpone the release of the iPhone 12 slightly than in previous years, and generally refers to the release in October. However, the whistleblower Jon Prosser also pointed out that this year's iPad and Apple Watch may be released independently in September , while the iPhone 12 will not be released until October.