WP - Tribe Events query by category

<?php

global $post;
$all_events = tribe_get_events(
    array(
        'eventDisplay'=>'upcoming',
        'posts_per_page'=>1,
        'tax_query'=> array(
            array(
                'taxonomy' => 'tribe_events_cat',
                'field' => 'slug',
                'terms' => 'your-category-slug'
            )
        )
    )
);

foreach($all_events as $post) {
setup_postdata($post);
?>