The background of the expected keynote for the month of September tells us that this has to be before the first fortnight of the month passes, the media are marking the 12th as the appointed day for the keynote and it may make sense.
Last year Apple presented the new iPhone models on September 12 and for the first time in Apple Park inside the Steve Jobs amphitheater. This year they could choose the same date that falls on Wednesday for the presentation of the new models of iPhone, iPad and who knows if a Mac.
There are several reasons why they could present their news that Wednesday 12, but the one that convinces us the most is that the week before is too early with the return from vacation and others, it is the second week of September so everyone is already in place and they also have enough margin to launch the new models presented without extending until October or similar. Waiting one more week or launching them on September 10 or 11 is not feasible for obvious reasons.
Apple usually has fixed ideas and in this case it is a continuation of what we have seen in recent years in terms of their iPhone presentations. It is also possible that the MacBook range launches with an update during this event and they may not even mention it, but it would be a good time to upgrade processors. We will have to be a little more patient and wait for a few more days of this hot month of August to pass (normally they are sent two weeks before the presentation) so that they send the invitations to the media and finally confirm whether this day will be the chosen .