It's that time of the year again when we all gather around our web browser and watch Apple's masterfully choreographed launch of the next iPhone (we believe the iPhone 7). It is safe to assume that with the Phone, they will also launch some ancillary products like the Watch or maybe even a new Macbook Pro.
Regardless of what they launch, you should be planning to watch the livestream starting on September 7 at 10 am PT (1pm ET).
You can go to the Apple Events page and watch the livestream there. As long as you do it from an IOS device running IOS 7 or better, a Mac using the Safari browser of a Windows PC using the Edge browser (this last one still perplexes me).
After the fact
If you miss the event (and you really have no excuse to miss it), then Apple will make the livestream available later on the same link of via the Apple Events podcast channel (which should work in most podcatchers).