How do I make a quiz invisible (or unavailable) until a future date?
When you create a Quiz activity, you can specify a date range outside of which the quiz is not available to your students. But, it will be visible to them as a future activity, unless you also make it invisible by clicking on the eye icon adjacent to the quiz reference. You will see the eye icon only when course editing mode is On. When the editing mode is Off you will see a greyed-out Quiz reference, and your students will see nothing at all there. This also removes it from the Calendar’s events list. When you want to make the Quiz reference visible again, turn editing mode on and click on the closed eye icon.