1st of all you should not use any space in URL. I would suggest to use - instaed of space.
For ename change the id in rule like, also consider digits 0-9 :
I have added 0-9 to the rule to make it optional and workable.
Also i would suggest to use optional trailing slash in the rule in case some one entered this URL:
localhost/polite/events/Dance/
instead of this:
localhost/polite/events/Dance
The short answer to your question is that you can’t make that redirection because the information is not in the URI that you’re using.
I suggest that you take a look at the mod_rewrite tutorial Article linked in my signature as it’s built from years of answering similar questions in this forum. Pay particular attention to an obscure little section where I recommend NOT using the id in the URI but using the ename. This HAS been implemented for years at http://wilderness-wally.com.