Example of how to change the archive title to remove 'Archive: ' and dynamically display the events slug set in settings

tw_ee_get_the_archive_title.php

<?php //Please do not include the opening PHP tag if you alreayd have one.

function tw_ee_get_the_archive_title($title) {

    if(is_post_type_archive('espresso_events')) {
        if(class_exists('EE_Registry')){
            $event_slug = EE_Registry::instance()->CFG->core->event_cpt_slug;
            return ucfirst($event_slug);
        }
    }
    return $title;

}
add_filter( 'get_the_archive_title', 'tw_ee_get_the_archive_title', 20, 1 );

tw_ee_get_the_archive_title_harcoded.php

<?php //Please do not include the opening PHP tag if you alreayd have one.

function tw_ee_get_the_archive_title_hardcoded($title) {

    if(is_post_type_archive('espresso_events')) {
        return 'Current Events';
    }
    return $title;

}
add_filter( 'get_the_archive_title', 'tw_ee_get_the_archive_title_hardcoded', 20, 1 )