Calendars can be viewed in Weekly, Monthly or List views by selecting the appropriate tabs.
If a specific view appears empty select another view and the calendar will refresh.
You can filter the calendar to display any combination of available calendars.
Select the small "Down" arrow and the list will appear. Simply check the boxes of the calendar(s) you wish displayed.
If you have a Gmail or Google account you can add any of the Trinity calendars to your calendar listing. Just click the + Google Calendar image and you'll be able to select which calendars you want to add.