This year the Hollands Historical Festival coincides with Prinsjesfestival and Open Monumentendag. As a result, you can visit the Binnenhof on Saturday and you can find the information stand of Open Monumentendag The Hague here. The Ridderzaal, the Upper and Lower Chamber are free of charge. There are also all kinds of other special locations and museums that are open on Saturdays and / or Sundays. The participating monuments can be recognized by the Open Monument Day flag during the weekend. This year’s theme is: Places of pleasure.
More information see website of Open Monumentday The Hague.