Query post by Category and custom file (ACF)

You make a few mistakes in your code.

To query posts by category you can use category_name [ref] or tax_query [ref] in query parameters.

// category_name / cat / category__and
'category_name' => 'event',

'tax_query' => [
    [
        'taxonomy' => 'category',
        'field' => 'slug',
        'terms' => 'event',
    ]
],

ACF checkbox are stored in custom field, as serialized array. For this reason, the value you are looking for (“News”) should be surrounded by double quotes.

'meta_query' => array(
    'key'       => 'type_id',  // custom field id
    'value'     => '"News"',   // custom field value
    'compare'   => 'LIKE'
),

---

Complete args:

$args = [
    'showposts'     => 6,
    'post_type'     => 'post',
    'category_name' => 'event',     // <-- category slug
    'meta_query'    => [
        [
            'key'     => 'type_id', // <-- ACF field id
            'value'   => '"News"',  // <-- ACF field value
            'compare' => 'LIKE'
        ] 
    ],
];
$the_query = new WP_Query( $args );