Someone just email me this good intro of sharing photo and comments on both iPhone and android apps. I know when we visit events, we like to take some photos for memory, reporting or say feedback of the event. So maybe you can do so to share by using the followin: http://www.liveshare.com/
Remember the event is for you and feel free to feedback on anything you experience in that event. Most importantly, have Fun there. :)
Here are my STGCC experience in 2009 and 2010
You can leave your comment here or on my facebook page too!