Event 2

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use kartik\widgets\SideNav;
// OR if this package is installed separately, you can use
// use kartik\sidenav\SideNav;
use yii\helpers\Url;
echo SideNav::widget([
    'type' => SideNav::TYPE_WARNING,
    'encodeLabels' => false,
    'heading' => <i class="fas fa-cog"></i> Operations,
    'items' => [
        // Important: you need to specify url as 'controller/action',
        // not just as 'controller' even if default action is used.
        //
        // NOTE: The variable `$item` is specific to this demo page that determines
        // which menu item will be activated. You need to accordingly define and pass
        // such variables to your view object to handle such logic in your application
        // (to determine the active status).
        //
        ['label' => 'Home', 'icon' => 'home', 'url' => ['/site/home'], 'active' => false],
        ['label' => 'Books', 'icon' => 'book', 'items' => [
            ['label' => '<span class="pull-right float-right float-end badge">10</span> New Arrivals', 'url' => ['/site/new-arrivals'], 'active' =>  false],
            ['label' => '<span class="pull-right float-right float-end badge">5</span> Most Popular', 'url' => ['/site/most-popular'], 'active' =>  false],
            ['label' => 'Read Online', 'icon' => 'cloud', 'items' => [
                ['label' => 'Online 1', 'url' => ['/site/online-1'], 'active' => false)],
                ['label' => 'Online 2', 'url' => ['/site/online-2'], 'active' => false)]
            ]],
        ]],
        ['label' => '<span class="pull-right float-right float-end badge">3</span> Categories', 'icon' => 'tags', 'items' => [
            ['label' => 'Fiction', 'url' => ['/site/fiction'], 'active' => false)],
            ['label' => 'Historical', 'url' => ['/site/historical'], 'active' => false)],
            ['label' => '<span class="pull-right float-right float-end badge">2</span> Announcements', 'icon' => 'bullhorn', 'items' => [
                ['label' => 'Event 1', 'url' => ['/site/event-1'], 'active' => false)],
                ['label' => 'Event 2', 'url' => ['/site/event-2'], 'active' => true)]
            ]],
        ]],
        ['label' => 'Profile', 'icon' => 'user', 'url' => ['/site/profile'], 'active' => false)],
    ],
]);