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Thanks Wissem and Mike, GWT gives now a good response, so it works! Cheerz,

In addition to Tom's response, you can also use Google Webmaster to remove the site out of the index a little faster: Follow these steps to remove a site or directory from Google's search results: On the Webmaster Tools home page, click the site you want. On the left-hand menu, click Optimization and then click Remove URLs. Click New removal request. Type the URL of the directory you want removed from search results and then click Continue. (How to find the right URL.) The URL is case-sensitive—use exactly the same characters and capitalization that the site uses. If you want to remove the whole site, you can leave this blank. Click Remove directory. Click Submit Request. Make sure you aren't accidentally linking to the dev site from your live site. I have seen this happen too many times.

no we use hyphens. Just for the example. And thanks for your answer. I think 3.1 would be an good idea. I thought just replacing the content would be good because then you refresh your content. You do not lose your link love and the event content would be very similar. We do not really want to rank for the old content. We want a visitor to come to the event page and register for the event. Have to think about it a little while

Thanks Matt, This is what i suggested and needed a bit of confirmation because i didn't know if this was the same with location based redirects.

Thanks Geoff. Will work on the rel=canonical. Problem is that we have like 60 pages like this with each 10 or more backlinks. For the total site it is something like 800 backlinks. Well work to do i guess.

I have a site that gets 2000 to 3000 posts per year of temporary content - these are very short posts.  The content is great for a few months but then the value is lost.  Each year we delete 2000-3000 pages of this content. Before we delete we look at analytics to see if any of these pages are pulling traffic.  If there are pages pulling traffic we 301 redirect those pages to relevant pages of evergreen content or create new pages for the redirect. After that all remaining URLs are 301 redirected to the homepage of the blog. Some of these pages might have a few links.  The redirects conserve them. To make this easy the posts are foldered by year /blog/2009/    /blog/2010/   /blog/2011/   etc.