In order to lock in your sequential and permanent Guerilla Drive-In Member Number, you must send in two things: the seven-digit access code that the MacGuffin is broadcasting, and a picture of you at the location. Here are new Guerilla Drive-In members 018, 019, and 023, skulking around the restrooms in dark glasses and hoodies:

There are a random selection of other New GDI Member pictures on my Flickr photostream; I’ve been posting the ones that I can crop and blur so they give away SOME hints without blowing the pony TOO badly. Others will follow.