There is a catch as usual.  It has to fit through a 10-inch diameter hole, and can't be something like a shoe which is too unsanitary or a baseball cap that is too porous according to USA Today

Slurpee's official Twitter site has been promoting the day, even giving suggestions on what you can use Saturday.

Not sure if your cup of choice will be accepted? Log on to Snapchat today to find out.  

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Waymo autonomous vehicles operate across 65 square miles inside I-285 and have been involved in six incidents with Atlanta Public School buses since May. Waymo issued a recall because of their cars briefly stopping or slowing down before continuing forward while a bus was stopped and flashing its lights. (Courtesy of Atlanta Public Schools)

Credit: Courtesy of Atlanta Public Schools