1. Open Google Calendar, and click on the Plus (+) sign next to Other calendars.
2. Click on the Browse resources option.
3. A list of different Google Calendars will appear. Simply select the Google Calendar you would like to access by clicking the check mark near the calendar name.
The next step below may not appear on certain Google Calendars. If an access prompt appears, please proceed with the step below.
4. In some cases you may be prompted to request access. Simply click on Request Access and wait for approval from the Admin of that Google Calendar.