long begin = new GregorianCalendar(2012, 5, 27, 9, 0).getTimeInMillis();
long end = new GregorianCalendar(2012, 5, 29, 18, 0).getTimeInMillis();
Intent intent = new Intent(Intent.ACTION_INSERT, Events.CONTENT_URI);
intent.putExtra(Events.TITLE, "Google I/O")
  .putExtra(CalendarContract.EXTRA_EVENT_BEGIN_TIME, begin)
  .putExtra(CalendarContract.EXTRA_EVENT_END_TIME, end)
  .putExtra(Events.EVENT_LOCATION, "Moscone Center West, San Francisco")
  .putExtra(CalendarContract.EXTRA_EVENT_ALL_DAY, true);
startActivity(intent);