Wasn't it last year?
Yes. It's been going on for about ten years.
The idea is to make it a worldwide event and create International Guitar Day.
This year was a treat because so many professional guitarists turned up.
I wonder if the 6,000+ realize who they played with and if the pros realize how many they played with.
There can't be that many members of the public, except in Wroclaw, who can say that they played Hey Joe with such a collection of guitarists as those who appeared on stage.