The buttons in general should only get enabled if creating events is possible. The same applies to other entry points. This is an improvement over what bug 1861210 already did.
Bug 1863520 Comment 0 Edit History
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The buttons in general should only get enabled if creating events is possible. The same applies to other entry points. We currently use the calCalendarDeactivator which gives us the info if all calendars are disabled, but it doesn't give us the context if events can be created. The best way to know that is to check the new event command. However, that means we'd also need to watch for enabled state changes of that command somehow. This is an improvement over what bug 1861210 already did.