It's National Tattoo Day on July 18th.
More on Tattoo Day and the other days on the 18th below.
The day shown for 'National Tattoo Day' is shown as we detected that day mentioned the most out of all the references to national days there were on July the 18th 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!