query_posts question

Hey, so this is kinda advanced.. I added a query post function so the posts show up by custom field date instead of the actual publish date. And I want all the old posts to be hidden so I added a todaysdate line the whole thing looks like this:

query_posts('showposts=20&category_name=events&meta_key=date&meta_compare=>&meta_value=' . $todaysDate . '&orderby=meta_value&order=ASC');

now on a subpage I want to do the listening a bit different but I can’t figure out how.
I still want to show all posts that are in the categorie events, my meta key should be now location and I just want to see locations with the meta value “XY” … but the order of the posts still should be done by meta_key=date and not location. How can I do that? So I have to figure out how I can define 2 different meta_keys in this command.. one for ordering and one for filtering… and then all the events that are older than todaysdate have to be hidden.