widget: mask sensitive events
It would be great to have a flag that marks sensitive calendar events. The practical effect would be to mask the event name in the calendar widget (iOS, Android). As an example, you might have an event of “surgery 2-5pm”; if marked as sensitive the widget would display it as “[event] 2-5pm”. As such you could still see that there is an event in the widget and you would still see the time, but you couldn’t see the name of the event name unless you went into Calendar. Events in the widget are often fairly visible to others when your phone is unlocked which is why I think this feature would be valuable.

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Phillip commented
I don't think I would personally get much use out of this but it's not a bad idea.