frontend/views/layouts/main-menu.php

<?php
use common\modules\product\models\Category;
use yii\helpers\Url;
?>
<?= \frontend\widgets\Rubrics::widget([])?>
<div class="fr">
    <ul>
        <li class="akciya"><a href="<?= Url::to (['event/index',]) ?>">Акции</a></li>
        <li class="brands"><a href="<?= Url::to (['catalog/brands']) ?>">Бренды</a></li>
    </ul>
</div>