code: public final void removeEntries(Entry<?>... entries) {
          if (entries != null) {
              for (Entry<?> entry : entries) {
                  entry.setCalendar(null);
              }
          }
      }
docs: Removes the given entries from the calendar. This is basically just a convenience
  method as the actual work of removing an entry from a calendar is done inside
  {@link Entry#setCalendar(Calendar)}.
  
  @param entries the entries to remove