drag and drop - Dropping onto an event (as opposed to the calendar) - how to identify event? -

i have implemented dragging of jquery-ui element onto fullcalendar. problem want drop onto not calendar specific event displayed on calendar in order add dropped item event. missing piece how identify event under mouse when dropped.

drop: function (date, allday, jsevent, ui) {    var event = ???;    event.description += ui.helper.data("filters").text;    $('#calendar').fullcalendar('updateevent', event); } 

i've discovered solution. have add "droppable" event element. catching "eventrender" (i assume spot)...

eventrender: function (event, element) {     // store id later...     $(element).data('id', event.id);     element.droppable({         drop: function (event, ui)         {             // id stored above...             var rowid = $(this).data('id');