There is not much off-road racing to be had here in AZ. Whiplash has high speed races which I do not care for.
www.whiplashracing.com
WORCS will be coming out to Speedworld Feb. 16 &17 this is very similar to a GNCC with some motocross and desert. Highly recommend going to this race.
www.worcsracing.com You will see the top off-road racers there competing.
Then on March 10 there is an enduro at the Lake Pleasant area. This year it will be a non-timekeeping event so you won't need a computer. This is a very good technical race to do as well. That's about it other than motocross.