If a due date is set on a flagged item, it will show up in the calendar tasks summary view.
Right-click the flag icon.
Select one of the following options for the date that you want the item to be completed:
Due Today
Due Tomorrow
Due This Week: Sets the item to be due at the end of the work week.
Due Next Week: Sets the item to be due at the end of the next work week.
No Due Date: Only available if a due date is set. Lets you remove the due date.