This library builds upon icalendar.el to get your calendar events into org mode.
You can define calendars to be imported like this:
(setq ical2org/calendars (list
(make-ical2org/calendar
:name "Personal calendar"
:org-file "/path/to/org/file"
:url "secret url to personal calendar")
(make-ical2org/calendar
:name "Work calendar"
:org-file "/path/to/org/file"
:url "secret url to work calendar")
))
Note that the org file will be overwritten.