function setUpConference_() {
  let scriptProperties = PropertiesService.getScriptProperties();
  if (scriptProperties.getProperty('calId')) {
    Browser.msgBox('Your conference is already set up. Look in Google Drive for your'
                   + ' sign-up form!');
                   return;
  }
  let ss = SpreadsheetApp.getActive();
  let sheet = ss.getSheetByName('Conference Setup');
  let range = sheet.getDataRange();
  let values = range.getValues();
  setUpCalendar_(values, range);
  setUpForm_(ss, values);
  ScriptApp.newTrigger('onFormSubmit').forSpreadsheet(ss).onFormSubmit()
      .create();
}
Uses the conference data in the spreadsheet to create
Google Calendar events, a Google Form, and a trigger that allows the script
to react to form responses.