On the right hand side of the page, click Add calendar.
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Select Add from directory to search for CU Boulder users who have made their calendar visible to you.
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Select your account from the dropdown.
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Search for a CU Boulder user in the Enter a name or email address field. Select the desired user from the list.
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Once you have selected the user's calendar you want to see, click Add.
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The shared calendar will now appear under the People's Calendars heading. Select it to see calendar events, and click the three dots next to its name to rename, change colors or remove.