The functionality (specifically the code) you are trying to track down will exist in /wp-content/plugins/{EventEspresso3Folder}/ and likely will NOT be named dt_intfc5228c10e15432.
It’s going to be a dynamically generated page likely created using add_menu_page() or add_submenu_page() some where in the source code of that plugin.
I haven’t used that plugin before so I can’t provide exact paths but the method I’ve described is the WordPress model most plugins follow. If you start searching the plugin code for those helpers it should help you track down the underlying functionality you are looking for.