WordPress at a glance
action is not described

comment_form_comments_closed action-hook . WP 3.0.0

Fires after the comment form if comments are closed.

Usage

add_action( 'comment_form_comments_closed', 'action_function_name_8627' );
function action_function_name_8627(){
	// action...
}

Where the hook is called

comment_form()
comment_form_comments_closed
wp-includes/comment-template.php 2191
do_action( 'comment_form_comments_closed' );

Where the hook is used (in WP core)

Does not used.