On a fresh install, Lumen doesn't bootstrap the facades, but the console/artisan does.
I had this same issue and tracked it down with Reflection.
You have the php_event pecl extension installed (http://php.net/manual/en/book.event.php). It gets loaded first and owns "Event". Then artisan tries to setup Event with class_alias and you get an exception.
I had that installed for use with ReactPHP. You could disable or setup Ev or Libevent if you need them for your app.
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