tribe_get_event_cat_slugs( $post_id )
Event Category slugs
Display the event category ID as a class for events wrapper
Source
File: src/functions/template-tags/general.php
function tribe_get_event_cat_slugs( $post_id = 0 ) {
$post_id = Tribe__Events__Main::postIdHelper( $post_id );
$slugs = wp_list_pluck( (array) get_the_terms( $post_id, Tribe__Events__Main::TAXONOMY ), 'slug' );
return apply_filters( 'tribe_get_event_cat_slugs', $slugs, $post_id );
}