Filtering out corresponding events in Unit 3 project

 Failed to execute 'contains' on 'Node': parameter 1 is not of type 'Node'.
    at HTMLFieldSetElement.<anonymous> (app.js:83)

$(activities).change(e => {
  //To get dollar sign
  let activityString = $(e.target)
    .parent()
    .text();
  const indexOfDollarSign = activityString.indexOf("$");
  let price = parseFloat(activityString.slice(indexOfDollarSign + 1));
  //To get Date and time of event
  const indexOfDash = activityString.indexOf("—");
  const indexOfComa = activityString.indexOf(",");
  console.log(indexOfDash, indexOfComa);
  const dateAndTime = activityString.slice(indexOfDash, indexOfComa);
  console.log(dateAndTime);

  if (e.target.checked === true) {
    startingCost = startingCost + price;
  } else if (e.target.checked === false) {
    startingCost = startingCost - price;
  }
  $("#total").text(`$${startingCost}`);

  for (let i = 1; i < activityInputs.length; i++) {
    /*
      find a way to filter out other events that share the same day and time of event user clicks

      Find which method works.

      Current code throws error:
      Failed to execute 'contains' on 'Node': parameter 1 is not of type 'Node'.
    */
    let input = activityInputs[i];
    if (input.contains(dateAndTime)) {
      console.log(true);
    }
  }
});