Google Calendar is now integrated with Google Classroom.
If you go to classroom.google.com and click on the three horizontal lines, you should see Calendar as an option.
You can also get to it by going to the About part of your Classroom.
It will be listed towards the bottom. If you have not recently created an announcement or assignment, the Calendar will not automatically be connected to your Google Calendar account. Once you do this, you can click on the link to open your Classroom calendar in your Google Calendar.
Now students, and teachers, can see when all of their assignments and questions are due. This should easily help with workflow.
You can follow the steps listed on the support, site http://ift.tt/1FfLix0, or watch the video to get more info. If you do not see it now, it should be there very soon.