what is this referring to?

@shankypanky The documenta in Kassel (Germany) is an international art exhibition, which usually takes place every five years. The last edition was overshadowed by an absolute antisemitism disaster, bringing back Germany's dark past from 1936.

I couldn't find any current English articles, the linked one down below describes a few of the problem with the last one.

Building on this, there are many discussions about how to prevent this in the future, artist's freedom, government funding, etc.

https://www.dw.com/en/documenta-15-trivialized-antisemitism-report-finds/a-64663005