function setUpCalendar_(values, range) {
  let cal = CalendarApp.createCalendar('Conference Calendar');
  // Start at 1 to skip the header row.
  for (let i = 1; i < values.length; i++) {
    let session = values[i];
    let title = session[0];
    let start = joinDateAndTime_(session[1], session[2]);
    let end = joinDateAndTime_(session[1], session[3]);
    let options = {location: session[4], sendInvites: true};
    let event = cal.createEvent(title, start, end, options)
        .setGuestsCanSeeGuests(false);
    session[5] = event.getId();
  }
  range.setValues(values);

  // Stores the ID for the Calendar, which is needed to retrieve events by ID.
  let scriptProperties = PropertiesService.getScriptProperties();
  scriptProperties.setProperty('calId', cal.getId());
}
Creates a Google Calendar with events for each conference session in the
spreadsheet, then writes the event IDs to the spreadsheet for future use.
@param {Array<string[]>} values Cell values for the spreadsheet range.
@param {Range} range A spreadsheet range that contains conference data.