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I have a backlink that I found from http://onucdm.onu.edu/mt/hmlref/2010/10/see_below.html . . . it is a nofollow, so it doesn't seem to be doing much harm. But this is obviously spam. It is from a .edu, so I'm not sure what I should do. Think it's harming my site at all? In general, how do you determine what to disavow?

I'm a professional magician and mentalist who travels nationally for corporate events, social functions, and trade shows. Unfortunately, the landing pages are all for different venues and locations, but the product stays the same. How do you recommend optimizing for somebody whose product is essentially themselves? The pages have similar content, videos, etc., so I don't want to be dinged for duplicate content.