While The Hague has plenty of bars, and I'm sure you'll figure it out,
please see below for some hints to help you all get started:
O'Casey's - http://www.ocaseys.nl
The Fiddler - http://www.fiddler.nl/
Grote Markt - http://www.gmdh.nl/ (Dutch)
Plein - https://www.pleindenhaag.nl/horeca-restaurants/ (Dutch)
Henri