Fullcalendar ครับ สอบถามเกี่ยวกับการแสดง Event (MVC C#.net)

$('#calendar').fullCalendar({
                    customButtons: {
                        activity: {
                            text: 'เพิ่มกิจกรรม',
                            click: function () {
                                window.location = '/Activity/Create';
                            }
                        }
                    },
                    header: {
                        left: 'activity',
                        center: 'title',
                        right: 'today prev,next',
                    },
                    buttonText: {
                        today: 'วันนี้',
                        month: 'เดือน',
                    },
                    //dayClick: function (date, jsEvent, view) {
                    //    window.location = '/Activity/Detail/' + date.format();
                    //},
                    defaultView: 'month',
                    eventLimit: true, // allow "more" link when too many events
                    navLinks: false, // can click day/week names to navigate views
                    locale: moment().locale('th'),
                    viewRender: function (view, element) {
                        setTimeout(function () {
                            var strDate = $.trim($(".fc-center").find("h2").text());
                            var arrDate = strDate.split(" ");
                            var lengthArr = arrDate.length;
                            var newstrDate = "";
                            for (var i = 0; i < lengthArr; i++) {
                                if (lengthArr - 1 == i) {
                                    var yearBuddha = parseInt(arrDate[i]) + 543;
                                    newstrDate += yearBuddha;
                                } else {
                                    newstrDate += arrDate[i] + " ";
                                }
                            }
                            $(".fc-center").find("h2").text(newstrDate);
                            $('.fc-toolbar').find('.fc-button-group').addClass('btn-group');
                            $('.fc-toolbar').find('.fc-button').removeClass('fc-state-default fc-corner-left fc-corner-right').addClass('btn btn-default btn-flat');
                            $('.fc-toolbar').find('.fc-prev-button').html($('<span />').attr('class', 'glyphicon glyphicon-chevron-left'));
                            $('.fc-toolbar').find('.fc-next-button').html($('<span />').attr('class', 'glyphicon glyphicon-chevron-right'))
                            $(".fc-left").find(".fc-activity-button").removeClass('fc-button btn-default').addClass('btn-primary').html('<i class="fa fa-plus-circle"></i> เพิ่มกิจกรรม');
                        }, 5);
                    },
                    events: {
                        url: '/Activity/Feed',
                        type: 'post',
                        data: {
                            '__RequestVerificationToken': $('input[name="__RequestVerificationToken"]', $('#__AjaxAntiForgeryForm')).val()
                        },
                        error: function () {
                            alert('there was an error while fetching events!');
                        },
                        //success: function (events) {
                        //    $('#calendar').fullCalendar('removeEvents');
                        //    $('#calendar').fullCalendar('addEventSource', events);
                        //    $('#calendar').fullCalendar('rerenderEvents');
                        //}
                        //color: 'yellow',   // a non-ajax option
                        //textColor: 'black' // a non-ajax option
                    }
                });

       //
        // POST: Activity/Feed
        [Authorize]
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Feed(string start, string end)
        {
            var currentUser = System.Web.HttpContext.Current.User;

            var startDate = DateTime.ParseExact(start, "yyyy-MM-dd", System.Globalization.CultureInfo.InvariantCulture);
            var endDate = DateTime.ParseExact(end, "yyyy-MM-dd", System.Globalization.CultureInfo.InvariantCulture);
            var output = new List<dynamic>();

                context.Activities
                    .Where(m => m.StartAt >= startDate && m.StartAt <= endDate)
                    .ToList().ForEach(m =>
                    {
                        output.Add(new
                        {
                            title = m.Name,
                            start = m.StartAt.AddDays(1).Date,
                            end = m.EndAt.AddDays(1).Date,
                            url = Url.Action("Detail", "Activity", new { id = m.Id }),
                            backgroundColor = m.StartAt.CompareTo(DateTime.Today) >= 0 ? "#3c8dbc" : "#f39c12", //Primary (light-blue), yellow
                            borderColor = m.StartAt.CompareTo(DateTime.Today) >= 0 ? "#3c8dbc" : "#f39c12", //Primary (light-blue), yellow
                        });
                    });

                return Json(output, JsonRequestBehavior.AllowGet);
        }