looks like there going to open the track up again this weekend for practice(dec 10 and 11), and from reading it will NOT REQUIRE a cma license or anything for that matter,pay your 30$ and ride the sessions all day.
this is from a post on another site:
Track is shaping up to be better than last weekend. Again, most of the rain missed the track. Track was groomed yesterday and will be regroomed again on Friday.
Get your bikes ready and come on out, regardless what the weather is doing elsewhere in the valley.
Bring your friends and let them see what MX is all about cause CMA license is not required this weekend.