TEC custom tax filters

function namespace_filter_department_term_link($termlink, $term, $taxonomy) {
    if ($taxonomy == 'departments') {
        $termlink = add_query_arg(
                array(
                    'post_type' => 'tribe_events',
                    'eventDisplay' => 'month'
                ),
                $termlink
        );
    }

    return $termlink;
}
add_filter('term_link', 'namespace_filter_department_term_link', 10, 3);

function namespace_tribe_events_filter_getLink($event_url, $type, $secondary, $term) {
    if ( $department = get_query_var('departments') ) {
        $event_url = add_query_arg( 'departments', $department, $event_url );
    }

    return $event_url;
}
add_filter( 'tribe_events_getLink', 'namespace_tribe_events_filter_getLink', 10, 4 );