Well, there is and it was last Saturday, May 14th. Initiated by Kolaj Magazine in 2018, it's an annual international celebration of collage. Artists and art venues are invited to hold events on that day to share the art medium that excels at bringing different things together to create new forms and new ways of thinking.
Above are the four I created while leading the class and watching the timer. Below you can see some that were done by those who took the class. Impressed? I sure am!