It's National Catalan Day on March 17th.
More on Catalan Day and the other days on the 17th below.
We detected 27 references to national Catalan day on 17th the March. There were also a total of 19 other national days mentioned including: Demonstration, Freedom Of Information, Military Family and Pancake Day.
The day shown for 'National Catalan Day' is shown as we detected that day mentioned the most out of all the references to national days there were on March the 17th across social media. Our algorithms examine all of the references to National Days across social media and updates whatnationaldayisit.com hourly, with our homepage displaying the current national day. This crowdsourcing of data method to assess the National Day date is used as opposed to being connected with any Government sacntioned lists :D Hurrah for democracy by concensus!