How to feed data in fullcalendar with laravel

I'm trying to feed the fullcalendar event property with json data from controller but is is not showing in the calendar, and I think I'm doing it well, but it's not. Please see my code below:

Controller

public function getCalendar(){
    $allBookings = Booking::with('itemsBooked')->get();
    $bookings = json_encode($allBookings);

    return view('admin.calendar.index', compact('bookings'));
}

view

<div id="jCalendar"></div>

Fullcalendar setup

$(document).ready(function(){
    $('#jCalendar').fullCalendar({
        header: {
            left: 'prev,next today',
            center: 'title',
            right: 'month,agendaWeek,agendaDay'
        },
        events: '',
        timezone: 'UTC',
        theme: true,
        themeSystem:'bootstrap3'
    })
});

Note: The fullcalendar setup is located at the bottom of the view, so I can use the $bookings variable there. But it is not showing even if I have data in my database.

Problems:

1. The data is not showing in the calendar.
   
2. How can I customize what data will be shown in the calendar.

via Chebli Mohamed