The date isn't a big deal anyway. The clue is in the name. It happens in Autumn. And its never going to be in September, as that'd be too close to the summer sale, nor will it be October due to Halloween sales, so it has to be November. And its not going to be majorly early or it will clash with Halloween. So its always going to be the last couple weeks of November.
And they've had autumn sales before too, and they were all at the end of November. like I said nothing in that e-mail is shocking or unexpected.