Add some text that says "Registrations Closed" to Event Espresso's single event, archive events, and calendar views if the event is upcoming but ticket sales have ended

ticket_sales_ended.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

add_filter('the_title', 'ee_add_on_sale_status_display', 101, 2);
function ee_add_on_sale_status_display($title, $id) {
    if(get_post_type($id) == 'espresso_events') {
        $html = '';
        $tickets = EEH_Event_View::event_tickets_available($id);
        if(empty($tickets)) {           
            $html = '<span class="ee-status small-text '
                  . 'event-active-status-DTE">'
                  . 'Registrations Closed'
                  . '</span>';
        }
        return $html . $title;
    }
    return $title;
}

add_filter( 
    'FHEE__EE_Calendar__get_calendar_events__tooltip_reg_btn_html', 
    'my_custom_calendar_tooltip_custom_text', 
    10, 
    3 
);
function my_custom_calendar_tooltip_custom_text( 
    $output, 
    $event,
    $datetime
) {
    if($event instanceof EE_Event) {
        $tickets = EEH_Event_View::event_tickets_available($event->id());
        if(empty($tickets)) { 
            $output = '<div class="sold-out-dv">Registration Closed</div>';
        }
    }
    return $output;
}