There is no cost to attend, but you need to register at the PRI website in order to get your credentials.
http://www.performanceracing.com/tra...istration.html
Everything I have seen regarding entry states that you need to be affiliated with a business in the performance industry or be a member of a
professional race team. This criteria may have changed since I last attended.
If you can go you will really enjoy it, but wear comfortable shoes because there will be a whole lot of walking!