Only certain ones bro.

http://www.freecomicbookday.com/Home/1/1/27/992

Just read this.

Only the onest hat carry the FCBD seal or are otherwise marked. They usually have a rack set aside for where the free comics are man. Its a promotion deal to get people more interested in comics. I myself have been faithfully attending such events for the last 3 years and am always overjoyed with the selections I make.

I'm there!