JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://arshaw.com/js/fullcalendar-1.5.1/fullcalendar/fullcalendar.css">
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.0/themes/ui-darkness/jquery-ui.css">
<script src="http://arshaw.com/js/fullcalendar-1.5.1/fullcalendar/fullcalendar.min.js"></script>
<div id='wrap'>

<div id='external-events'>
<h4>Draggable Events</h4>
<div class='external-event'>My Event 1</div>
<div class='external-event'>My Event 2</div>
<div class='external-event'>My Event 3</div>
<div class='external-event'>My Event 4</div>
<div class='external-event'>My Event 5</div>
<p>
<input type='checkbox' id='drop-remove' /> <label for='drop-remove'>remove after drop</label>
</p>
</div>

<div id='calendar'></div>

<div id="dialog" title="Basic dialog">
    <p>This is the default dialog which is useful for displaying information. The dialog window can be moved, resized and closed with the 'x' icon.</p>
</div>


<div style='clear:both'></div>
</div>

CSS

body {
        margin-top: 40px;
        text-align: center;
        font-size: 14px;
        font-family: "Lucida Grande",Helvetica,Arial,Verdana,sans-serif;
        }

    #wrap {
        width: 1100px;
        margin: 0 auto;
        }

    #external-events {
        float: left;
        width: 150px;
        padding: 0 10px;
        border: 1px solid #ccc;
        background: #eee;
        text-align: left;
        }

    #external-events h4 {
        font-size: 16px;
        margin-top: 0;
        padding-top: 1em;
        }

    .external-event { /* try to mimick the look of a real event */
        margin: 10px 0;
        padding: 2px 4px;
        background: #3366CC;
        color: #fff;
        font-size: .85em;
        cursor: pointer;
        }

    #external-events p {
        margin: 1.5em 0;
        font-size: 11px;
        color: #666;
        }

    #external-events p input {
        margin: 0;
        vertical-align: middle;
        }

    #calendar {
        float: right;
        width: 900px;
        }

JavaScript

$( "#dialog" ).dialog();
        /* initialize the external events
        -----------------------------------------------------------------*/

        $('#external-events div.external-event').each(function() {

            // create an Event Object (http://arshaw.com/fullcalendar/docs/event_data/Event_Object/)
            // it doesn't need to have a start or end
            var eventObject = {
                title: $.trim($(this).text()) // use the element's text as the event title
            };

            // store the Event Object in the DOM element so we can get to it later
            $(this).data('eventObject', eventObject);

            // make the event draggable using jQuery UI
            $(this).draggable({
                zIndex: 999,
                revert: true,      // will cause the event to go back to its
                revertDuration: 0  //  original position after the drag
            });

        });


        /* initialize the calendar
        -----------------------------------------------------------------*/

        $('#calendar').fullCalendar({
            header: {
                left: 'prev,next today',
                center: 'title',
                right: 'month,agendaWeek,agendaDay'
            },
            editable: true,
            droppable: true, // this allows things to be dropped onto the calendar !!!
            drop: function(date, allDay) { // this function is called when something is dropped

                alert('dropped');
                // retrieve the dropped element's stored Event Object
                var originalEventObject = $(this).data('eventObject');

                // we need to copy it, so that multiple events don't have a reference to the same object
                var copiedEventObject = $.extend({}, originalEventObject);

                // assign it the date that was reported
                copiedEventObject.start = date;
                copiedEventObject.allDay = allDay;

                //...