You can add new events and update existing events by importing them from an external iCal file into your Calendar.
Import events from an iCal file
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Select the course you want your events to be grouped under by clicking on it from the calendar menu.
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Click Import Events.
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Click Browse on the Import Events page to search for the iCal file containing your events. If you want to import the events into a specific group or section, select it in the Attendees drop-down list.
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Click Open, then click Import.