Hi Meghan,
That’s certainly possible though it requires adding some custom code – either to your theme’s functions.php file or (preferably) a custom plugin. The basic form looks something like this:
function events_related_posts_override( array $query_args ) {
$query_args[ 'tax_query' ] = array(
array(
'taxonomy' => Tribe__Events__Main::TAXONOMY,
'field' => 'slug',
'terms' => 'birthdays',
)
);
return $query_args;
}
add_filter( 'tribe_related_posts_args', 'events_related_posts_override' );
In the above example, I’m limiting related posts to those assigned to a category with a slug of ‘birthdays’, but you could easily adjust as needed.
Does that help at all?