NOT THE ORIGINAL U2 WALL

The reference to "23.9, 1997" in some of the graffiti most likely refers to the date of U2's iconic concert in Sarajevo, which took place on September 23rd, 1997. This concert was a significant event, held just two years after the Bosnian War ended. U2 performing in Sarajevo was a symbol of hope and healing for the city, making this date a powerful reference for fans.

The inclusion of "Miss Sarajevo" in the graffiti could be seen as a direct link to the concert, as the band performed the song during the show.