How do I transfer a secondary calendar (one of "My calendars") to someone else?

Calendars that are listed under My calendars can be transferred to other Google accounts.

NOTE:  Before transferring ownership, the user that will be taking on ownership must first have permissions to the calendar.
  1. Open Google Calendar on your computer
  2. On the left, under My calendars
    1. Hover over the calendar you want to transfer
    2. Click options (three dots)
    3. Click Settings and sharing
  3. Scroll down to the Share with section
  4. Click Add people and groups
    1. Enter the email address of the person who the calendar will be transferred to
    2. In the Permissions dropdown, select "Make changes and manage sharing"
    3. Click Send
    4. An email will be sent to the person to accept the share
  5. Once accepted, return to the Settings and sharing section (step #2)
  6. Click the dropdown next to the added name, and select "Transfer ownership"
  7. Confirm by clicking "Transfer ownership" again; the new owner has 60 days to accept.