A day dedicated to celebrate the hard work and efforts of Cosplayers all over the world

Cosplay Appreciation Day is on Nov 13, 2023

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Cosplay Appreciation Day started on Nov 13, 2012 by Gail Simone.

The following was Tweeted:

I say today is COSPLAY APPRECIATION DAY. Seriously, post your favorite cosplayers on Twitter, Facebook and Tumblr to show you support them.
— Gail Simone 💙💛 (@GailSimone) November 13, 2012