Registration closed March 29, 2017 11:59 PM at 2017-03-29T21:59:00-0700 Registration ends March 29, 2017 11:59 PM at 2017-03-29T21:59:00-0700 Registration opens March 3, 2017 12:00 AM at 2017-03-02T22:00:00-0800 Registration runs from March 3, 2017 12:00 AM to March 29, 2017 11:59 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.