If you add an Assignment of the type 'offline assignment', it will show up in the course and gradebook, but will not require interaction from the students. You can then choose to hide it in the course if you don't want the kids to know its there but will see their grades for it. If you hide it in the gradebook too, they won't know the grades you record either.
Hope that helps.
Can I have a gradebook entry without an assignment?
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