String str =
"BEGIN:VCALENDAR\r\n" +
  "VERSION:2.0\r\n" +
  "PRODID:-//Microsoft Corporation//Outlook 14.0 MIMEDIR//EN\r\n" +
  "BEGIN:VEVENT\r\n" +
    "UID:0123\r\n" +
    "DTSTAMP:20130601T080000Z\r\n" +
    "SUMMARY;LANGUAGE=en-us:Team Meeting\r\n" +
    "DTSTART:20130610T120000Z\r\n" +
    "DURATION:PT1H\r\n" +
    "RRULE:FREQ=WEEKLY;INTERVAL=2\r\n" +
  "END:VEVENT\r\n" +
"END:VCALENDAR\r\n";

ICalendar ical = Biweekly.parse(str).first();

VEvent event = ical.getEvents().get(0);
String summary = event.getSummary().getValue();

ICalendar ical = new ICalendar();
  VEvent event = new VEvent();
    Summary summary = event.setSummary("Team Meeting");
    summary.setLanguage("en-us");

    Date start = ...
    event.setDateStart(start);

    Duration duration = new Duration.Builder().hours(1).build();
    event.setDuration(duration);

    Recurrence recur = new Recurrence.Builder(Frequency.WEEKLY).interval(2).build();
    event.setRecurrenceRule(recur);
  ical.addEvent(event);

String str = Biweekly.write(ical).go();