Sounds cool!
My interpretation is, it says "2 people from your website can come", so I assume other websites have been sent this also, and it's up to each website to choose 2 people, and then for the questions it'll be 2 people from here, and a bunch of people from all the other websites that have been sent this, and each person asks a question.
It sounds like the photo thing is for everyone who attends the concert, not just the questioners.