[Evolution] One too many calendars

[John K Taber <jktaber charter net>]

Something went wrong when I imported my old Outlook calendar. Dates were
imported to a calendar named Birthdays and Anniversaries under Contacts
(don't ask me how).

What was intended was to import to On This Computer, to Personal.

How do I get rid of the unwanted Contacts/Birthdays and Anniversaries?

The list of calendars appears as

On This Computer
   Personal

Contacts
   Birthdays and Anniversaries