The MacGuffin is the secret AM transmitter broadcasting the code that lets you get updates about when and where we'll be showing 16MM at secret locations around the area.
Folks that have already found the MacGuffin last year may have a badge, of course. And folks that find the MacGuffin this year get a badge. But that's the only way to get this badge -- they cannot be bought!
More about the MacGuffin on the Guerilla Drive-In site: