WP Project Manager has a calendar feature for your projects. You can view a special calendar view of your projects and tasks. To view the calendar, navigate to-
WP-Admin → Project Manager → Calendar
You will find a calendar and there is a drop-down menu showing all your open and available project. Select the project you want to get a calendar view of and click on the Filter button.
This will update the calendar and show all your teams tasks according to their assigned dates. You can also customize the calendar according to month, week and day.