Originally the poster was going to be a takeoff on the summers T-shirt image, where the cities were molded into a funky form of the continental US. That didn't pan out in development and we went with a different look but keeping within the same genera.
My instincts are to push the lettering to the limits or legibility and leave the uninitiated in the dust but the good art direction by Dennis O'Reilly helped make it readable yet still full of psychoidylicism. The poster is 24x36. The block at the bottom is where the list of sponsors will go.