The easiest way to broadcast from a venue is to use our new iOS app called Concert Window Broadcaster. With your iPhone or iPad, you can broadcast live over wifi or 4G. Just give your phone to a friend or roadie, either in the audience or on the side of the stage, or use a tripod like the Gorillapod ($20). You can use an audio feed from the soundboard using the iRig Pro which plugs into your iPhone/iPad.
Some folks also get good results with a laptop and a USB webcam. In this case you can also use an iRig Pro to bring in soundboard audio to the laptop.
If you have a full pro setup and would like to webcast that way, go for it! Once you've scheduled the show on your channel, just go into your broadcast page, grab the RTMP URL and RTMP Stream Name, and plug it into your encoder. You'll be able to monitor the stream on your broadcast page in Test mode before you go live.
If you're putting together your own setup from scratch, Concert Window can only offer limited support. You'll find plenty of better detailed advice on online forums like this one. We have a few blogs published that highlight large scale broadcasting (like this article), but beyond that, we regret we can’t offer further tech support. There are just too many variables to troubleshoot.
That said, if you use the app or a laptop, it can be straightforward and fun to broadcast shows from a venue.