Blackboard Learn Calendar events can be pushed out to third-party calendars such as Outlook and Google via an iCalendar feed. Once the iCalendar feed is set up on a third party calendar, updates to events are automatically reflected on the third party calendar. Blackboard Learn's iCalendar feed also sets the refresh time to 4 hours. The support for refresh times varies across third-party calendars.
Login to Blackboard and navigate to the My Blackboard menu then click the calendar icon.
Below the list of calendars click the button Get External Calendar link
Copy the URL with the .ics extension.