New iPhones to Debut on September 10 According to File Found in iOS 13 Beta 7

Apple today released the seventh beta of iOS 13, and an image hidden within the update suggest Apple is going to hold an event to show off new iPhones on Tuesday, September 10.An iOS 13 screenshot in the beta, covertly named "HoldForRelease," features the Calendar app with the date set to Tuesday the 10th.
The screenshot was originally found by iHelpBR, and the site points out that a similar screenshot was found last year ahead of the September 12 iPhone event with a September 12 date.September