The Event Feed allows attendees to post messages and pictures into a Live Feed in the app. Even if they're not social media natives, attendees get a buzz from posting pictures to the feed for others to enjoy and comment on. 

You can also add your Twitter hashtag to the event details to include any Tweets about your event! 

To add your Twitter hashtag, go to Setup > Edit Event Info and type it into the Twitter hashtag box just above the event description.