You cannot always create participants using EventKit of this version, because Apple does not have associated APIs.
But you can use the dump class to output the EventKit header files to see that all interfaces even included private and checked it each time.
I saw an application called "Week Cal" that can add visitors to the iOS event repository, and this app is Appstore-sale, and no jailbreak is needed. Therefore, I believe that there is a way to add visitors to the event store in the current iOS and Apple will not be rejected.
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