It's National Smile Day on May 31st.
More on Smile Day and the other days on the 31st below.
We detected 2,317 references to national Smile day on 31st the May. There were also a total of 63 other national days mentioned including: Donut, Championship Over Memorial, Dam Safety Awareness and Heat Awareness Day.
The day shown for 'National Smile Day' is shown as we detected that day mentioned the most out of all the references to national days there were on May the 31st 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!