gn_wendy - 8:24 am on Apr 22, 2010 (gmt 0)

If any of those 10,000 pages have incoming links - why not 301 removed/deleted pages to the relevant "parent category" or "overview page" --- or since it's events the really cool and advanced thing to do would be to redirect "blue widget get-together 2007"; "blue widget get-together 2008" and "blue widget get-together 2009" and point them to "blue widget get-together 2010"

If the pages haven't been deleted, but are there for reference purposes then I would make sure they link back to the parent category with breadcrumbs and also link from all past "blue widget get-together" events to the current one.

canonicals are for canonicals aka. exactly the same or close-to-identical content pages.

thoughts?