If your school has implemented this feature (it must first be enabled in the Admin Console), you can display upcoming assignments for students in the Parent & Student Portal. Here's how to do it:
First, create an assessment in the Plan tab. With the assessment selected, open the Advanced Settings dialog andcheck the box for "Show as Upcoming". Next, enter a "Show Until" date. The assessment will appear in the Parent & Student Portal until the date you set here. If you'd like to upload documents, click "View/Add Docs". Any documents that you upload here will be visible to all of your students in the portal, and will be available for download.