How to show the root webpage on all subpaths

Question

I want to show the same page on all the subpaths on my web site

/events/
/events/firstOne
/events/secondOne/edit
/events/whatever/blahblahbla/helloworld

All that urls must load the same root page.

On that page (/events/) I have a react script that will handle everything from there with react router, but, right now, if I try to load any thing different than /events/, I just get a not found error.

How can I match a wildcard on that url?

EDIT:

I have tried to do it with add rewrite rule, as recomended on this answer: https://wordpress.stackexchange.com/a/213322/164509, but doesn't work either

I have added this to my funtions.php file:

// /public_html/wp-content/themes/kava/functions.php
<?php


function custom_rewrite_basic() {
  add_rewrite_rule('^events/([a-z]+)/', 'show_event', 'top');
}
add_action('init', 'custom_rewrite_basic');



if ( ! class_exists( 'Kava_Theme_Setup' ) ) {

    /**
     * Sets up theme defaults and registers support for various WordPress features.
     *
     * @since 1.0.0
     */ 
    class Kava_Theme_Setup {

        ....

Then I refresh the rewrite rules database by clicking on save permalinks on the admin page.

But when I try to load /events/asdf I still get a 404 not found error.