I had one of those opportunities! The symphonic metal band, Within Temptation, was playing a few dates in the U.S., and one of them was at Terminal 5 in NYC. After contacting their label and some emailing back-and-forth, I managed to secure a photo pass for one of my favorite bands!
The concert was great, aside from some technical difficulties during "Angel." They never finished it sadly (one of my favorite songs by them).
After the initial three songs were over, it was a pain trying to find a good spot to take additional photos from the crowd, and this was after asking different security staff if it was okay, with different answers every time. Despite that, I had fun! :D
More pics can be on my Flickr!