dayClick: function(date, jsEvent, view) {
     // call the model
},

<a href="#" data-toggle="modal" data-target="#myModal"..................../>

<a href="<?php echo site_url('model/add') ?>" data-toggle="modal" data-target="#myModal" role="button" class="btn-u btn-block"> Add</a>

eventClick:  function(event, jsEvent, view) {
            $('#modalTitle').html(event.title);
            $('#modalBody').html(event.description);
            $('#eventUrl').attr('href',event.url);
            $('#calendarModal').modal();
        },

<div id="calendarModal" class="modal fade">
<div class="modal-dialog">
    <div class="modal-content">
        <div class="modal-header">
            <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span> <span class="sr-only">close</span></button>
            <h4 id="modalTitle" class="modal-title"></h4>
        </div>
        <div id="modalBody" class="modal-body"> </div>
        <div class="modal-footer">
            <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        </div>
    </div>
</div>
</div>

dayClick: function(date, jsEvent, view) {
    $("#myModal").modal("show");
},

eventRender: function(event, element) {
                        element.attr('data-toggle', "modal");
                        element.attr('data-target', "#sched-modal");
                        element.attr('href', "/details");
                    }