I don't think you will really have too big of a problem, people are so distracted by all of the other ideas being pitched. I participated in at the last Startup

I don't think you will really have too big of a problem, people are so distracted by all of the other ideas being pitched. I participated in at the last Startup Weekend in NYC, and out of little more than 100 people, 60+ of them presented there own ideas. I think people are more in your boat, of trying to get their idea built, than trying to steal ideas. And if you're idea being made public is going to ruin it, then it probably is going to be hard to be successful in the first place. Ideas are out there, but the passion within you is what really makes them happen. If you do pitch, do a good pitch because you need to stand out and get people to vote on your idea to be one of the 20 or so that is chosen. I pitched at the last event, and got enough votes to continue, and actually went on to win the event, so msg me if you want tips. I am thinking of writing an article on it...