As I was searching for photos in the hashtag '#artraveathens" I saw the following tweets by a greek citizen. I translate for you what he tweeted:
https://twitter.com/SantaCoast/statu...30916621754368
"Something incredible happened...I was walking through OAKA(the Olympic Stadium) and some people approached me. They were talking english...
https://twitter.com/SantaCoast/statu...31129553965056
and they told me that they were giving me free tickets for Lady Gaga and to get immediately into the stadium. I told them "no thank you" and they told me...
(his last tweet didn't have a hashtag but I searched for his account)
https://twitter.com/SantaCoast/statu...31265193574400
"take 20 euros and get in the stadium, we need more people. I told them again "no thank you" and left. Lol"
This is the picture of the stadium when the song 'ARTPOP' starts.
