1. Create two Grade categories, one for your activities still being graded, and one for your released activities.
   2. Ensure that "Aggregate including subcategories" (an advanced option) is unchecked for your top level      course grade category.
   3. Edit the "unreleased" category's "course total" item.
   4. Set the "grade type" to "none".
   5. Tick the "Hidden" checkbox.
   6. Save your changes.
   7. Move all your activities being graded in the "unreleased" category.
   8. Move all your activities already graded in the "released" category. 

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