How your Calendar list is organized

Your calendars are listed in the calendar list to the left of the page in Google Calendar. Here's a brief description of what you'll find in each section:

My calendars

This section includes calendars that you've created or have the ability to edit. Shared calendars will appear in this section only if you have permission to Make changes AND manage sharing. Your primary calendar will always be the first calendar listed in this section. (The primary calendar is the default calendar displayed when you first signed in to Google Calendar.)

Other calendars

You'll find all other calendars in this section of your calendar list. To add more calendars, simply click the drop-down arrow next to Other calendars to view the available options. (If you're an Apps user, this section will also list the calendars of other domain members that you've added to your calendar.)
At this time, calendar names are displayed in alphabetical order, but your primary calendar will always be listed first.