Hello @to_brien
Sometimes deleting an Assignment from the Calendar can remove your due dates or change the status to not count toward the students grade. You may want to verify that you didn't accidentally hide the active Calendar for the course you were working in by using this guide on How do I filter the Calendar view by course as an instructor?
I would like to recommend that you check your Quizzes tab to see if it is actually missing or if it may have been accidentally saved as a non-graded quiz or survey & I would also suggest looking in your Assignments Tab, to see if it might have been accidentally grouped with assignments that are not counted toward the student grades.
Either of those status changes on an quiz settings would make it so the quiz no longer appears in the Gradebook.
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