watchOS: Fetching EventKit calendars - more than enabled - ios

I have a watchOS (only) app and fetching calendars and events for these calendars. In my Watch App I have set the calendar app to mirror the calendars from iPhone. When I now uncheck a calendar on iPhone as active my app still get this disabled calendar when fetching all calendars.
Why do I get disabled calendars from EventKit? This is the line I am using to fetch calendars:
EKEventStore().calendars(for: .event)
Also the problem occurs when I set calendars not to mirror, instead set custom calendars for the watch still all calendars got fetched.
How can I just fetch the calendars that are really active.
The calendars only have these properties, so nothing where I can check if active or not:
EKCalendar <0x127fb6f0> {title = Test1; type = CalDAV; allowsModify = NO; color = #1BADF8;}
Any ideas?

I had submit an apple TSI. The result is that this functionality is not supported. The answer:
We have reviewed your request and have concluded that there is no supported way to achieve the desired functionality given the currently shipping system configurations.

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The EKEventStore provides access to the calendar/reminder resources that are available to the OS that are configured by the user.
It is not possible to configure a separate event store for private developer use.
Reminders can be made local so they are not synced in the cloud.
However, if the device has reminder lists that are synced to the cloud, then it is no longer possible to access the local reminders either by your app or the Reminders app.
This same behavior seems to apply to local Calendars where I answered a question about their availability at Local EKCalendar saved with not errors, disappears.
The question at Unable to create local EKCalendar (Reminders) if iCloud is set to not sync Reminders seems to support my conclusions and suggests this behavior has been present for at least a couple of years.

Add Invitees to calendar event programmatically iOS

I've been trying to look for the answer to this quite some time.
Apple EventKit documentation isn't allowing changing meeting invitees programmatically since those properties in an EKEvent are read-only.
I'm trying to find a way to create a calendar meeting (not necessary using EventKit), adding invitees to the meeting and setting it programatically.
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As you already figured out you cannot currently write meeting fields in iOS (AFAIK EventKit is the only API giving you access to the calendar database on iOS).
If you know what kind of account it is (and get the credentials from the user), you could sidetrack EventKit and directly create meetings on the server. Eg using EWS when the account is on Exchange or CalDAV when the account is on iCloud or Apple Calendar Server etc.
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I am quite new to iOS, and I would appreciate if you can give me a clue on how to tackle this issue.
I am planning a mobile application and a cloud service to require "Google calendar is sync with the calendars on mobile devices" ( namely iPhone, iPad, and Android )
On Android, I can read calendar's event id from our Android app. If I change event attributes such as tile and time etc, the event id stays unchanged, and it seems to be a good way to associate our meta data to it (i.e. event id).
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The following link says
"EKEvent's eventIdentifier is likely to be changed when event changes"
http://developer.apple.com/library/ios/#documentation/EventKit/Reference/EKEventClassRef/Reference/Reference.html#//apple_ref/occ/instm/EKEvent/eventIdentifier
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If there was a change made to one of the recurring calendar events the identifier can also have exception date at the end:
88E45678-2S11-574E-ABF8-3B1E463ERF4C:google_calendar_id#google.com<!ExceptionDate>20121025

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