Yii2 full calendar event filtering not working

I'm using Philipp Frenzel FullCalendar in Yii2 framework and its working perfectly. I want to implement basic filter events on calendar base on option select but my codes still not working. Help would be highly appreciated.

This is main.js :

$("#Model_attribute").change(function(){
    filter_id = $(this).val();
    if (filter_id != '0') {
        var events = $('#event').fullCalendar( 'clientEvents', function(event) {
        if((filter_id == '0') ) {
            return true;
        }else{
                //what I need to write here to filter events on calendar????
        });
    }
}
});

This is option select code :

<select class="Model_attribute" id="select_name">
        <option value="all">All Tech</option>
        <option value="0">Hendy Nugraha</option>
        <option value="1">Ginanjar Nurwin</option>
        <option value="2">Rio Andhika</option>
</select>

this is inside event-index :

<?=\yii2fullcalendar\yii2fullcalendar::widget(array(
  'events'=> $events, 
  'id' => 'event',
  'clientOptions' => [ 
    'editable' => true,
    'draggable' => true,
    'droppable' => true,
    ],
  'eventClick' => "function(calEvent, jsEvent, view) {

            $(this).css('border-color', 'red');

            $.get('index.php?r=event/update',{'id':calEvent.id}, function(data){
                $('.modal').modal('show')
                .find('#modelContent')
                .html(data);
            })

            $('#calendar').fullCalendar('removeEvents', function (calEvent) {
                return true;
            });

       }",
));

?>

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