$('#calendar').fullCalendar({
   eventRender: function(event, element) {
      element.bind('dblclick', function() {
         alert('double click!');
      });
   }
})

dayClick:function( date, allDay, jsEvent, view ) {
            var singleClick = date.toUTCString();

            if(doubleClick==singleClick){
                console.log('Double-click!');
                doubleClick = null;
            }else{
                doubleClick=date.toUTCString();
                clearInterval(clickTimer);
                clickTimer = setInterval(function(){
                    doubleClick = null;
                    clearInterval(clickTimer);
                }, 500);
            }
        }

$("#calendar").fullCalendar({
    dayRender: function(date, element, view){
        element.bind('dblclick', function() {
            alert('double click!');
        });
    }
});

$.each(
{
    mouseenter: function(seg, ev) {
        _this.triggerSegMouseover(seg, ev);
    },
    mouseleave: function(seg, ev) {
        _this.triggerSegMouseout(seg, ev);
    },
    click: function(seg, ev) {
        return view.trigger('eventClick', this, seg.event, ev); // can return `false` to cancel
    },
    mousedown: function(seg, ev) {
        if ($(ev.target).is('.fc-resizer') && view.isEventResizable(seg.event)) {
            _this.segResizeMousedown(seg, ev, $(ev.target).is('.fc-start-resizer'));
        }
        else if (view.isEventDraggable(seg.event)) {
            _this.segDragMousedown(seg, ev);
        }
    }
}, and so on .......

dblclick: function(seg, ev) {
        return view.trigger('eventDoubleClick', this, seg.event, ev); // can return `false` to cancel
    },

eventDoubleClick: function(calEvent, jsEvent, view) {

    alert('Event: ' + calEvent.title);
    alert('Coordinates: ' + jsEvent.pageX + ',' + jsEvent.pageY);
    alert('View: ' + view.name);

    // change the border color just for fun
    $(this).css('border-color', 'red');
}

function eventElementHandlers(event, eventElement) {
    eventElement
    .click(function (ev) {
        if (!eventElement.hasClass('ui-draggable-dragging') &&
            !eventElement.hasClass('ui-resizable-resizing')) {
            return trigger('eventClick', this, event, ev);
        }
    })
                .hover(
        function (ev) {
            trigger('eventMouseover', this, event, ev);
        },
        function (ev) {
            trigger('eventMouseout', this, event, ev);
        }
    );
    // TODO: don't fire eventMouseover/eventMouseout *while* dragging is occuring (on subject element)
    // TODO: same for resizing
}

.dblclick(function (ev) {
        return trigger('eventDblClick', this, event, ev);
    })

eventDblClick: function (calEvent, jsEvent, view) {
   // Create a new appointment
}

dayClick: function(date, jsEvent, view) {
            prevTime = typeof currentTime === 'undefined' || currentTime === null
                ? new Date().getTime() - 1000000
                : currentTime;
            currentTime = new Date().getTime();

            if (currentTime - prevTime < 500)
            {
                //double click call back
                console.log("this is double click");
            }
        },

bindSegHandlersToEl: function(el) {
    this.bindSegHandlerToEl(el, 'touchstart', this.handleSegTouchStart);
    this.bindSegHandlerToEl(el, 'mouseenter', this.handleSegMouseover);
    this.bindSegHandlerToEl(el, 'mouseleave', this.handleSegMouseout);
    this.bindSegHandlerToEl(el, 'mousedown', this.handleSegMousedown);
    this.bindSegHandlerToEl(el, 'click', this.handleSegClick);
},

this.bindSegHandlerToEl(el, 'dblclick', this.handleSegDoubleClick);

handleSegClick: function(seg, ev) {
    var res = this.view.publiclyTrigger('eventClick', seg.el[0], seg.event, ev); // can return `false` to cancel
    if (res === false) {
        ev.preventDefault();
    }
},

handleSegDoubleClick: function(seg, ev) {
    var res = this.view.publiclyTrigger('eventDoubleClick', seg.el[0], seg.event, ev); // can return `false` to cancel
    if (res === false) {
        ev.preventDefault();
    }
},

eventDoubleClick: function(calEvent, jsEvent, view) {
    alert('Event: ' + calEvent.title);
}