https://www.cnet.com/news/when-is-the-2018-iphone-apple-event/

Another day has passed with no sign of an Apple event invite where the company is expected to announce its next series of iPhones (including followups to the iPhone 8, 8 Plus and iPhone X), but that doesn't mean the event isn't happening. Considering our original guess of Sept.12, we still expect an invite to pop up in our inboxes tomorrow. Cutting it close to Labor Day is pretty normal for Apple; last year's invites were sent on the same Thursday day.

While we have no confirmation or knowledge of when the exact unveiling and release dates will occur (Apple didn't reply for a request to comment), examining the dates that Apple picked over the past few years offers a rather consistent schedule to extrapolate some strong possibilities for the 2018 dates.