I often want to have all of my work the next day checked off, so there should be a feature to add a strikethrough on non-submittable assignments (such as readings and in paper submissions). In order to not confuse these manual strikethroughs with submitted online assignments, these strikethroughs can be a different color (such as always orange or something). When you click on the popup of an assignment on the calendar w/ out an online submission, there should be a (marked as complete) option.