Registration closed April 28, 2018 2:59 PM at 2018-04-28T12:59:00-0700 Registration ends April 28, 2018 2:59 PM at 2018-04-28T12:59:00-0700 Registration opens March 10, 2018 12:00 AM at 2018-03-09T22:00:00-0800 Registration runs from March 10, 2018 12:00 AM to April 28, 2018 2:59 PM
The only requirement here is that you have a MotorsportReg account. Once you've created an account you can specify your intent to attend and how many guests you will be bringing with.