Sparkle. Even though Sparkle is no longer with us, Summer is continuing the tradition. From Summer's blog:
"But before I show you the graphic, I wanted to tell you a little bit about the history of Cat World Domination Day. It started in 2012, with this blog’s predecessor, Sparkle. June 24 of that year was her tenth birthday, and my human wanted to do something special for her. So she created a holiday that fit right in with her personality. Because Sparkle was known for her books and advice on how cats can dominate the humans in their lives, Cat World Domination Day only made sense. You can see the blog post for the very first Cat World Domination Day here.