The Upcoming/Classes tile is available from the Student Dashboard in Atlas. There are two tabs, Upcoming and My Stellar Classes.
This tab displays the upcoming 7 days' worth of items from the dashboard calendar and academic calendar.
The My Stellar Classes tab displays any classes for which you are currently registered, with links to the class website in Stellar. Note: Classes from Sloan's Canvas LMS, Residential MITx, and Moodle are not included.