How come no one performs Klingon Opera?

But they do:

’u’  :

The opera had its official debut at the Zeebelt Theater in The Hague, Netherlands, on 10 September 2010 […] Performances of ’u’ were held in the Zeebelt Theatre in The Hague on 17 February 2012 and in Rijeka, Croatia, on 25 February 2012.[24] The opera was performed in Berlin on February 22, 2013.