This article discusses software internally used by Apple.
Acquiring a copy without Apple's consent is illegal and may result in being scammed.
(latest known version)
Meetings is an internal application presumably used to create, invite people to, keep track of, and similar tasks relating to, meetings for Apple employees. It has a URL scheme of meet://. Opening it prompts for access to Calendar.
The app is capable of displaying events present in the Calendar app. Tapping on any button aside from an Event crashes the app with an NSInternalInconsistencyException, reason threading violation: expected the main thread.
Tapping on an Event shows details about the Event. At the bottom are displayed three options - Accept, Maybe, and Decline. Tapping on any of them crashes the app.
Before the app crashes, it displays this: