JSFiddle - React, Tailwind, and code Playground

HTML

<div id="cal">
    <button class="fc-event-time" id="1">test button - doesn't have to be a button</button>
    <button class="fc-event-time" id="2">test button 2 - should alert as well</button>
    <button class="something-else" id="2">test button 3 - shouldn't alert</button>
</div>

JavaScript

(function () {
    var cal = document.getElementById('cal');
    var myFn = function (e) {
        if (e.target.className === 'fc-event-time') {
            alert('clicked');
        }
    };
    cal.addEventListener('click', myFn);

})();