If you want to do this for Events categories then you can set the taxonomy to ‘tribe_events’.
What do you exactly mean with it? I try this, but it dont work 🙁
<?php
$args = array(
'taxonomy' => 'tribe_events'
);
$categories = get_categories($args);
foreach((get_the_category()) as $childcat) {
if (cat_is_ancestor_of(7, $childcat)) {
echo $childcat->cat_name;
}}
?>
I am sorry, I think my WordPress Codex know-how is not enough here.