Question

I can drag the event but I can’t drop it. I mean I can drag it around as long as I’m holding it. But when I release event it immediately returns to the position before the drag.
And so the event eventDrop has not ever been called.

I have all properties set to right values. Have checked them multiple times. All other functions like resize work fine.

calendar = $('#calendar').fullCalendar({
    monthNames: ['Январь', 'Ферваль', 'Март', 'Апрель', 'Май', 'Июнь', 'Июль', 'Август', 'Сентябрь', 'Октябрь', 'Ноябрь', 'Декабрь'],
    monthNamesShort: ['январь', 'февраль', 'март', 'апрель', 'май', 'июнь', 'июль', 'август', 'сентябрь', 'октябрь', 'ноябрь', 'декабрь'],
    dayNames: ['Воскресенье', 'Понедельник', 'Вторник', 'Среда', 'Четверг', 'Пятница', 'Суббота'], 
    dayNamesShort: ['ВС', 'ПН', 'ВТ', 'СР', 'ЧТ', 'ВТ', 'СБ'],
    buttonText: {
        prev:     ' ◄ ',
        next:     ' ► ',
        prevYear: ' << ',
        nextYear: ' >> ',
        today:    'сегодня',
        month:    'месяц',
        week:     'неделя',
        day:      'день'
    },
    titleFormat: {
        month: 'MMMM yyyy',
        week: "d[ yyyy]{ '—'[ MMM] d, MMMM, yyyy}",
        day: 'd, MMMM, yyyy, dddd'
    },
    columnFormat: {
        month: 'dddd',
        week: 'ddd, d.M',
        day: 'dddd d.M'
    },
    timeFormat: {
        agenda: 'H:mm{ - H:mm}',
        '': 'H(:mm)'
    },
    weekMode: 'liquid',
    header: {
        left:   'title',
        center: '',
        right:  'agendaDay,agendaWeek,month today prev,next'
    },
    defaultView: 'agendaWeek',
    allDaySlot: false,
    axisFormat: 'H:mm',
    defaultEventMinutes: 60,
    slotMinutes: 30,
    minTime: 8,
    maxTime: 20,
    firstDay: 1,
    editable: true,
    selectable: true,
    selectHelper: true,
    disableDragging: false,
    disableResizing: false,
    select: function (start, end, allDay) {
            ...
        },
    eventClick: function (calEvent, jsEvent, view) {
            ...
        },
    eventResize: function(event, dayDelta, minuteDelta, revertFunc) {
        ...
    },
    eventDrop: function(event, dayDelta, minuteDelta, allDay, revertFunc) {
        ...
    }
}); 

Answer 1

This is a know bug. I assume you are using the most recent version of jQuery; version 1.7+
If that’s the case you need to update fullcalendar.js to the most recent build.

$ git clone https://github.com/arshaw/fullcalendar.git
$ cd fullcalendar
$ make
$ cd build/fullcalendar

copy *.js and *.css files