You can register here: https://www.motorsportreg.com/index.cfm ... U5NWxF0yB8
PCA members with fewer than 5 autocrosses with PCA-SDR are required to pre-register for SDR autocrosses on MotorSportReg.com.
You may not sign up on the day of the event at the track.
Thank you,
AX pre-reg team