At the bottom of the calendar page, there is an "Import or export calendars" link, click it. On the page that comes up, click on the Export calendar button, choose the events that you want to export, and either click the "Get calendar URL" or "Export" button. (The export button will generate an iCal file and the URL button will have the same available via a URL.) Import such into your calendar tool.
NOTE: The live sessions, assignments, etc. in Summer School will appear in the calendar entries --not the courses themselves. (The links will be to the appropriate activity in the appropriate course.) If you want to see all of the courses you are in, after logging in to the site click on "My Courses" instead of "My Calendar".