When Is National Costume Day?


National Costume Day is on the 17th of June with 151 tweets.

More on Costume Day below.



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About Costume Day

Is It Costume Day Today?

It's Costume day on the 17th of June.

Costume Day' is by our calculation on: June the 17th. The first time we detected Costume Day was the 21st of May 2015 and the most recent detection of references to Costume Day was 2 years, 6 months ago.

We're now tracking the sentiment around every mention of Costume day to show how people feel about Costume. See if people like Costume here.
We're detecting how Costume affects other things more widely than just being a celebrated day. See how Costume affects company share prices.

There were many celebrations relating to national holdiays written about on social media that our algorithms picked up, on the 17th of June. In total we detected 81 total unique days being shared such as Flip Flop Day which had 1,785 people talking about it, or Eat Your Vegetables Day having 367 tweets. A random sample of which are shown below.


National days on the 17th of June

National Costume Day, on the 17th of June

How Is The Date For Costume Day Calculated?

The day shown for 'National Costume Day' is based off how much chitter-chatter and buzz there was on June 17, 2016 across social media making references to 'Costume Day'. 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, including others such as: Aboriginal, Mascot or Ex Day. This crowdsourcing of data method to assess the National Costume Day date is used as opposed to being connected with any Government sacntioned lists :D Hurrah for democracy by concensus!


I'd Like To Promote National Costume Day

We've put together the following resources full of nifty tips on how to increase the reach of Costume Day. The resources include: graphs, badges, and resources on what steps to take to boost Costume Day's visibility.

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National Costume Day

It's Costume Day
On June 17th

Can I Register Costume Day?

We don't have an international authority or governmental remit to declare any officially celebrated "national Costume day". We only aim to programatically reflect what 'National Day' it is based of what The Internet Says It Is. We believe this is much more fun as it reflects the nature of how the most amusing / interesting national days are often created organically and grow based off popular social trends and sharing, as such we don't add new days to our database unless they are organically observed on social media.


Is it National Costume Day Everywhere?

Yes? No.. Sort of | Maybe ¯\_(ツ)_/¯

What's really intersting is how whilst some National Days like National Daughters Day are seemingly celebrated internationally irrespective of geography, some very popular days (That often become the No. 1 National Day on our homepage) are in fact locally very specific and are offical holidays celebrated on a Country's national calendar. Take National Rambutan Day for instance, Rambutan is a popular Souteast Asian fruit and not seen so much in the UK, Europe or the USA. Some regionally specific trends subsequently become immensely popular internationally and worldwide, partly fuelled by widely shared 'National Days', National Pabebe Wave Day being one such example.

teenagers sharing national days on social media

Hang On, It Was National Costume Day Already This Year..!?

Yes, this is strangely enough entirely possible. The date shown for National Costume Day can change, if for instance several hundred people tweeted about Costume Day in early April, then in May a few thousand people tweeted about Costume day, then the date shown for National Costume Day, could come up twice :D

We have also detected mentions of Costume day on;



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For people who wish to promote National Costume Day, we've put together the following resources.
See also: How does Costume affect the share price of Apple, Facebook, Microsoft?
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