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 Family 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.