jquery fullcalendar drop non event on event

i have trouble to drag and drop an item (its not an event, its an employee name) on an event.

I want to drag an employee (see picture) on an event, but the 'employee' is no event. I am using jquery UI draggable/droppable.

<script>
var calendar;
$(document).ready(function() {
    calendar = $('#calendar').fullCalendar({
    droppable: true,
    dropAccept: '.employeeItem',    
    drop: function(date, allDay, jsEvent, ui) {

}
});
});   

$(function() {
$(".employeeItem").draggable();
$(".fc-event").droppable({ 
    drop: function(event, ui) { 

    }
});
});
</script>

<?php for($i=1;$i<=30;$i++){?>
   <div>Simpson, Homer<br>
      10 / 14 h
   </div>
<?php }?>

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

After dropping an employee on an event, i need the corresponding event data (event-id etc) to save the process to the db. But jquery fullcalendars "drop (callback)" only provides the date that the item was dropped on.

from jquery fullcalendar drop non event on event