Replace "Enter Title Here" placeholder text

enter-title-here.php

<?php

function PREFIX_change_title_text( $title ){
     $screen = get_current_screen();
  
     if  ( 'events' == $screen->post_type ) { // Replace 'events' with key of your custom post type
          $title = 'Enter event name with date';
     }
  
     return $title;
}
  
add_filter( 'enter_title_here', 'PREFIX_change_title_text' );