Hi,

The plugin automatically places the event short description as og:description

If you want to modify something in the og you can check out the file /includes/posts/class.post-stec_event.php line 27.

There is a filter that you can use to override the default og meta.

Example:

add_filter('stec_single_og', function ($og, $post_id) {
   
    $og_meta = '
        <meta property="og:title" content="' . esc_attr(get_the_title($post_id)) . '" />
        <meta property="og:description" content="' . esc_attr(get_the_excerpt($post_id)) . '" />
        <meta property="og:url" content="' . esc_url(get_permalink($post_id)) . '" />
        <meta property="og:image" content="' . esc_url(get_the_post_thumbnail_url($post_id, 'full')) . '" />
        <meta property="og:type" content="website" />
    ';

    return $og_meta;
}, 10, 2);

If Yoast SEO is enabled the plugin will use teh Yoast SEO og meta instead.