To register for an NEQ event you must be a member of the Audi Club of North America. When you join the ACNA you will automatically be a member of the Chapter you reside in.
If you are interested in joining the ACNA and the NEQ Chapter, you can find further information at the Audi Club North America site.
To register for an NEQ event as an existing member simply visit Motorsports Reg. This is the NEQ part of MotorsportReg.