Animeleague

Yes, you read it right. Every year, Free Comic Book Day allows fans to obtain a selection of free comic book titles at participating comic book shops worldwide. A complete listing of all the participating titles is available at the Free Comic Book Day website

The date you ask...May 6th, and yes, it is WORLDWIDE.

This years' titles include...
Preview versions of Shaman King Flowers,
Choujin X,
Rooster Fighter,
Lovely Muco,
Welcome to Demon School! Iruma-kun,
Animal Crossing New Horizons: Desert Island Diary,
Kirby: Mania.
Issue #0 of Street Fighter 6: The Comic Book series

So, get down to your local comic book shop and ask them if they are participating in FREE COMIC BOOK DAY!