Creates a new Register button in CE login form

register_button.php

<?php
/**
 * Create a new register button in Community Events Login Form.
 */

add_action('tribe_community_after_login_form', 'modern_tribe_register_button', 10, 2 );

function modern_tribe_register_button() {
   wp_register( '<button id="register">', '</button>', true );  
}