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Hi Laurel, It really depends on the quality you want of the live stream. It can be incredibly difficult to get a great live stream for a high-quality event. That is the primary reason that we don't do live streams for MozCon is because we'd greatly have to up our budget and amount of a/v people to keep the MozCon-quality. You also want to take in consideration of how many people are there and how big the room is. What kind of experience do you want to have? Who are they paying attention to? For small events, Usestream or even a G+ hangout/event can work well. You'll get the best audio and video if there's a microphone plugged in to the live streaming system and a video camera focused directly where you need it to be. I'm a big fan of outsourcing the a/v and bringing in a professional. Especially since it sounds like you have lots of other things on your plate. Taking care of a/v is a full-time job at an event.