code: public GoogleEntry insertEntry(GoogleEntry entry, GoogleCalendar calendar) throws IOException {
          Event event = converter.convert(entry, Event.class);
          event = dao.events().insert(calendar.getId(), event).execute();
          entry.setId(event.getId());
          entry.setUserObject(event);
          return entry;
      }
docs: Performs an immediate insert operation on google server by sending the
  information provided by the given google entry. The entry is associated
  to this calendar.
  
  @param entry The entry to be inserted in a backend google calendar.
  @param calendar The calendar in which the entry will be inserted.
  @return The same instance received.
  @throws IOException For unexpected errors