I get media credentials for the Chicago Auto Show. I registered again last month. The registration site always asks me about the professional organizations that I belong to and these are the choices: Midwest Automotive Media Association (MAMA) American Auto Racing Writers and Broadcasters Association American Racing Press Association (ARPA) American Society of Journalists and Authors Automotive Press Association (APA) Eastern Motorsport Press Association Int'l Motor Press Association (IMPA) Motor Press Guild (MPG) Motor Sports Press Association National Motorsports Press Association National Press Club National Press Photographers Association New England Motor Press Association (NEMPA) Texas Auto Writers Association Washington Automotive Press (WAPA) Western Auto Journalists (WAJ) Can I join any of these organizations as a walk-up or do I need to show proof that I work someplace? Are any of you a member of one of these organizations? Thanks for your help.