If you are keen to show tweets from Twitter at your event, you should check out Visible Tweets!
It lets you display a visualisation of Twitter messages which have been designed to be displayed in public spaces, with elegance. You could use it on display screens to show conversations about a particular topic.
To get started, just type a word into the box and then let the app do its thing. It then shows continuous tweets. This would be a great tool for conferences, concerts or wherever people will gather and write tweets.