Using Permalinks / URL Rewrite with custom php code….

Hey everybody – I apologize upfront if this has been covered already (or stupid), but I’ve been stumped for a few days on it so I figured I’d give it a shot…

I’m working on a concert venue site. I’ve got the calendar / show-listing part hardcoded into the theme code AND with using ExecPHP in widgets and Pages. I use 2 wp pages with custom PHP code in them – one to LIST the shows and one for show DETAIL. I’m just passing a GET variable to the DETAIL page to bring up the correct show id. No issues there. 🙂

However, I’m also using one of the pre-packaged permalink structures (the date and name based one actually) for access to my pages and posts. So basically for the show details page I’m using URLs like this…

“http://domain.com/show-details/?show_id=123”

Its not pretty, but it works – my question is, if I want to add some re-write rules to work in addition to the ones that the permalink enables (i.e. domain.com/show_details/2008/1/23/ArtistName/ – passing the date and artist name instead of the show_id) – how would I do that and still “play nice” with WP?

Maybe just point me in the right direction?

Thanks everyone!
Ry