If you do not want Attendance to appear in the Gradebook as a graded assignment, you can edit the Attendance assignment and change the assignment type. Students can still view the assignment but it will not appear in their grades.
To remove the assignment from the Gradebook, edit the attendance assignment, then in the Display Grade as menu [1], select the Not Graded option. At the bottom of the window, click the Save button [2].
Note: Once you have changed the assignment type, you cannot change it back to a graded assignment. Please ensure you do not want to grade Attendance before changing the assignment type.