Laravel 5: Missing Argument Controller

I am calling the EventController with the action() from my navbar:

<a href="">

In the EventController:

public function list_events($host_id)
    {
        $events = 'Hallo';
        return view('list_events',['$events' => $events]);
    }

And when I open it in the browser the following error occurse:

ErrorException in EventController.php line 60: Missing argument 1 for App\Http\Controllers\EventController::list_events()

via AppleForTheKing