when :EVENT
            case key
            when :DTSTAMP, :UID, :DTSTART, :CLASS, :CREATED, :DESCRIPTION,
              :GEO, :LAST_MOD, :LOCATION, :ORGANIZER, :PRIORITY, :SEQUENCE, :STATUS,
              :SUMMARY, :TRANSP, :URL, :RECURRENCE_ID, :RRULE, :DTEND, :DURATION,