Custom Post Type modify the UI

wp-cpt-ui-mods.php

<?php

function tscpl_pb_edit_titles( $title ) {

  $screen = get_current_screen();

  switch ( $screen->post_type ) {
    case 'event':
    case 'eventsregistration':
    case 'eventsapi':
      $title = 'Event Title';
      break;

    case 'registration':
      $title = 'Customer Name';
      break;

    default:
      $title = $title;
  
  }

  return $title;

}
add_filter( 'enter_title_here', 'tscpl_pb_edit_titles' );

/*---------------------------------------------------------------------------------------------------------------------------------------------------*/

function tscpl_remove_program_book_post_published( $messages ) {
    if ( get_post_type() == 'events' ) {
        unset( $messages[post][10] );   // Post draft updated. Preview post
        //unset( $messages[post][9] );  // Post scheduled for: Jan 12, 2013 @ 19:03. Preview post
        //unset( $messages[post][8] );  // Post submitted. Preview post
        //unset( $messages[post][7] );  // Post saved.
        unset( $messages[post][6] );    // Post published. View post
        //unset( $messages[post][4] );  // Post updated.
        //unset( $messages[post][3] );  // Custom field deleted.
        //unset( $messages[post][2] );  // Custom field updated.
        unset( $messages[post][1] );    // Post updated. View post
    }
    return $messages;
}
add_filter( 'post_updated_messages', 'tscpl_remove_program_book_post_published' );

/*---------------------------------------------------------------------------------------------------------------------------------------------------*/

function tscpl_program_book_hide_permalink( $return, $id, $new_title, $new_slug ) {
  if ( get_post_type() == 'events' ) {
	$return = '';
	$post = get_post( $id );
	if ( $post->post_status == 'publish' ) {
	  $link = 'https://tscpl.org/events/';
	  $return = 'Events Link: <a href="' . $link . '">' . $link . '</a>';
	}
  }
  return $return;
}
add_filter( 'get_sample_permalink_html', 'tscpl_program_book_hide_permalink', 15, 4 );

/*---------------------------------------------------------------------------------------------------------------------------------------------------*/

function tscpl_program_book_events_remove_addnew() {
    //remove_submenu_page( 'edit.php?post_type=events', 'post-new.php?post_type=events' );
    remove_submenu_page( 'tscpl-pb-export', 'post-new.php?post_type=events' );
}
add_action( 'admin_menu', 'tscpl_program_book_events_remove_addnew', 999 );