If you are responsible for managing multiple calendar accounts and the individual has already given you access, follow these steps to view multiple calendars:
1. Login to your Google Calendar
2. On the left side, Check the box next to the calendar you want to view
3. You can view as many calendars at one time as you would like
a. You can choose default colors for each calendar by clicking the Options icon beside the calendar name and selecting a color b. The checkbox beside the calendar name will appear in the chosen color
5. If you no longer need access to the calendar and would like to remove it from your list, you can click the X to unsubscribe to the calendar