Again, I'd love to beef articles up as a first course of action but I don't think beefing up a "March 2009 widgets convention" article will do much good in 2012 :P
No, you are right about that. But then again,
how much value for the user does a March 2009 widgets convention" article have?
Does it get lots of clickthoughs from links on other pages? What is the time on page like? What is the bounce rate like? How much social interaction does it get (lots of comments and facebook likes)?
I am NOT asking to be snarky; I am asking because I intend to do something along the same lines as you; have a directory of widget workshops. I have not figured out what to do for pages that list information for past workshops.
My suggestion is to find some way that the information can be used in to
provide more value to the users, as opposed to just being search engine fodder.
Could it somehow be re-purposed to make the pages more useful to the user? Maybe instead of keeping several different historical workshop pages, you can create one page by year, and list all of the workshops in that city for the year of 2009?
I think you just have to ask yourself;
Why is this information useful to the user? What will be
the best format for them to use this information? What will they do with this information?
I think that you and I are both thinking about the search engines first and the users second, and we need to change that mode of thinking if we wish to continue ranking well in the future.
Just my two centavos.