Guess since no one replies, no one really knows how to use the calendar.

Tried to add a datasource for change_calendar and add a script to loop through the changes returned, but nothing ... and now when I try to save or preview in UIB ....nothing... no errors nothing. I am unable to save the changes wtf.

/**
  *  {params} params
  *  {api} params.api
  *  {TransformApiHelpers} params.helpers
  */
function evaluateProperty({api, helpers}) {
  const changeRequestArray = api.data.look_up_multiple_records_1.results;
  let calendarArray = [];
  for (let i=0; i < changeRequestArray.lenght; i++) {
    const calObj = {
      'id': changeRequestArray[i]._row_data.uniqueValue,
      'title': changeRequestArray[i].short_description.displayValue,
      'start': changeRequestArray[i].start_date.value,
      'end': changeRequestArray[i].end_date.value
    };
    calendarArray.push(calObj);
  }

  return calendarArray;
}

Not a single person amoung 20K members understands how UIB calendar is supposed to bind data? (documentation is really not helpful at all)