I just finished talking to a reporter from one of the tradeshow and conference magazines about how to research starting a new event.  One of the things I mentioned was making sure your event was highly targeted for a niche community.  When I’ve said this, most people tell me their idea and it’s still rather broad.  As a general guidepost, take the audience you think is the perfect niche for your event (or website) and cut it in half again.  What you’re left with is probably the right niche.Worried about getting too niche?  Don’t.  Here’s a blog about one thing and one thing only - tomatoes - http://www.TomatoCasual.com.