You can modify the relationship field’s query with this ACF filter.
It’s been awhile since I’ve worked with The Events Calendar but it’d likely be something comparable to:
// change relationship field name in filter
add_filter('acf/fields/relationship/query/name=your_relationship_field_name', 'prefix_events_relationship_query', 10, 3);
function prefix_events_relationship_query( $args, $field, $post_id ) {
$today = date('Y-m-d');
$args['meta_query'] = array(
array(
'key' => '_EventStartDate',
'value' => $today,
'compare' => '>=',
)
);
return $args;
}
You may need to adjust the start date custom field name or the date format of today’s date but this is the general direction you’d head.
