Form field missing label

Our site gets dinged in accessibility audits because the <select> field for the month view in the calendar header.

The current markup looks like this:

<div class="mvSelectNavigation">
  <select>
    <option value="day">Day</option>
    <option value="week">Week</option>
    <option value="month" selected="">Month</option>
  </select>
</div>

With a label it might look something like this:

<div class="mvSelectNavigation">
  <label for="display-select">
    Select a Calendar Display
  </label>
  <select id="display-select">
    <option value="day">Day</option>
    <option value="week">Week</option>
    <option value="month" selected="">Month</option>
  </select>
</div>

The page I need help with: [log in to see the link]