Ask HN: Critique my concept

I am toying with the idea of starting a new website. After reading another post (and trying a site) today, I was struck, as I'm sure many people have been before, at how inadequate dating sites are. This led me to this idea: a site in which possible matcheswould be selected based on interest in attending a variety of events. I guess the rough idea is a "what-to-do" dating mashup, where the pool of possible daters is narrowed by interest in certain thematic events i.e. charitable stuff, jazz concertgoers, outdoorsy things etc. I did a quick google search and couldnt really come up with anything that was doing this, and thought it might be a neat idea. Comments/Refinements welcome. Also, if anyone wants to work on this, I would be happy to collaborate with someone.