Hi,

You can override the default template by adding following filter in your theme or child-theme functions.php file:

add_filter('page_template', function($template) {
    $post = get_post();
              
    // Admin_Helper resides in \ Stachethemes \ Stec \ namespace   
    if ($post->ID === \ Stachethemes \ Stec \ Admin_Helper::get_stec_page('organizer')) {
        
        $template = get_stylesheet_directory() . '/' . 'custom-organizers.php';
    }
    return $template;
}, 9999);

Sorry, the only way to override the organizer's permalink at the moment is by editing the method get_permalink() in file \stachethemes_event_calendar\assets\php\o.organizer.php line 53.

If you don't have too many organizers you could add switch there and point each organizer to their link.

Example:

public function get_permalink() {
        switch ($this->id) {

            case 1: // case for organizer with id#1

                return esc_url('https://...');

            case 2: // case for organizer with id#2
                return esc_url('https://...');

            case 3: // case for organizer with id#3
                return esc_url('https://...');
                
            default:
                // The default behaviour if no case is found
                if (null !== $this->permalink) {
                    return esc_url($this->permalink);
                }
                $page_id = Admin_Helper::get_stec_page('organizer');
                if (!$page_id) {
                    return null;
                }
                $page = Admin_Helper::get_permalinks('organizer', 'stec_organizer');
                if (class_exists('SitePress')) {
                    $default_locale = Admin_Helper::get_default_locale();
                    if ($default_locale !== ICL_LANGUAGE_CODE) {
                        $page = ICL_LANGUAGE_CODE . '-' . $page;
                    }
                }
                $replace = apply_filters('stec_organizer_get_permalink_replace_name_spaces_with', '_');
                $name = str_replace(' ', $replace, $this->get_name());
                return esc_url(home_url($page . '/' . $name));
        }
    }