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With this type of discrepancy, that's often the case. Either the site has been penalized or the linking sites have been devalued in some way (say, a link network). DA/PA basically model the raw strength of the link profile, but they don't account for some quality factors. Of course, that assumes the toolbar PR is up-to-date and accurate, which is a fairly big assumption these days, IMO.

I fully agree about the links warpath. My point is that in my opinion you are at far greater risk from trying to hide the nature of the interconnected sites with machinations on hosting, IP addresses etc, than to simply legitimately link them. Any attempt to artificially pass significant ranking influence between these related sites is bound to be caught by Google eventually because there are just too many signals available for Google to spot. While I'm unwilling to say "never" where Google's algorithm is concerned, I would say a legitimate, natural interlinking between these sites is BY FAR the safest approach, compared to the alternatives. The only safer way would be not to interlink at all. I do feel your pain. Google is playing with people's livelihoods with these inaccurately applied penalties, whether algorithmic or manual. Paul

Just like having a blog on your site, old blog posts are still "worth it" to keep as old blog posts. If there's enough content on a page that's related to the past event, then I would keep that event page so it remains in the index. You're adding new content to your site, and perhaps adding photos from the event or other text/copy about the event would help and be useful to users who look at it after it's happened. If you have photos, then next year you can provide a link to last year's event, and that might be useful in future promotions of the event. If it's an event that happens around the same time every year (it's an annual event), then you might want to create a unique page or pages on the site just for that event. People search for the names of specific events in certain locations (i.e., New Orleans Mardi Gras) and you might be able to rank in the search results for that event name. In that case, I would probably not specify the year on the event page: or simply update the page every year with the latest info and the date of the event. If this is an event calendar and there's not going to be a lot of content on the event listing, then you might actually run into duplicate content issues or potentially Google "panda-like" issues for having a lot of low quality content on the site. You may want to go ahead and remove those old event listings and only keep current, future listings on the event calendar.