Prevents the <title> attribute for the page (displayed in the browser tab) from changing to “Events for <month> <year> – <sitename>” when navigating in a calendar embedded in a page using a full calendar shortcode.

prevent_title_change.php

<?php
(function () {
    var lastTitle = undefined;
    function checkTitle() {
        if (lastTitle != document.title) {
            document.title = 'My Desired Title';
            lastTitle = document.title;
        }
    setTimeout(checkTitle, 100);
    };
    checkTitle();
})();