This issue iss resolved by adding the following line to the-events-calendar/lib/the-events-calendar.class.php line 2436. Please let me know what branch in the git repo you need me to submit a pull request against if you want me to contribute the sollution in that fashion.
$newRules[$singleBase . ‘([^/]+)/?$’] = ‘index.php?’ . self::POSTTYPE . ‘=’ . $wp_rewrite->preg_index( 1 );