I think the website idea would be cool and if you could create say an RSS feed that those affiliated SC2 sites might be able to somehow use to update something (such as a sidebar) with what's on or a brief list ?
Not sure how feasible that is but it could be slightly more automated, key in something so people can reply or get directly linked to the relevant location for signups/detailed information/streams and it creates a bit more streamline.
I'm no webguy so this could just all be impossible, but the internet does some crazy wonderful things.
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