var $this = $(element);

$(async function(){
    cal = $this.myCalendar(options);
    updateMonth();

    function loadDisabledDates( id, month, url, done) {
        $.getJSON( url, function( data ) {
            done(data);
        });
    }

    var calendarURL = createCalendarURL(currentId, cal.getMonth());

    // CALLBACKS
    loadDisabledDates(currentId, cal.getMonth(), calendarURL, function (data) {
        disableUnavailableDates($this, data, cal.getYear(), cal.getMonth());
    });

    // PROMISES
    loadDisabledDatesWithPromise(currentId, cal.getMonth(), calendarURL)
        .then(function (data) {
            // stuff in here
        })
        .catch(function (error) {
            // stuff with errors here
        });

    // ASYNC / AWAIT
    let data;

    try {
        data = await loadDisabledDatesWithPromise(currentId, cal.getMonth(), calendarURL)
    } catch (error) {
        console.log(error);
    }

    console.log(data)
});