Can anyone tell me the location and/or event shown in the video?
Pilsudski square in Warsaw. The event in the video I believe is the first anniversary of John Paul II ( death) in 2006.
Here is a link en.wikipedia.org/wiki/Piłsudski_Square
I would suspect it was after JP2 died, but don't know for certain.
He died in 2005 and gathering was during the daytime, this was the night vigil in 2006 in my opinion.