I did a few years back...
I'm in the equipmental rental business (nothing to do with automotive) and just filled out the paperwork required to get an entry badge with my current business info. Nobody ever questioned me or my business. Paid the money and went and enjoyed....really a must do for any car guy at least once.
Look here...
https://www.compusystems.com/servlet/ar?evt_uid=158&tCode=SEMAWS
regards,
Mike