With SO MUCH SHIT INFO on Facebook, I emailed the actual State Park office because there is NOTHING on that website either...
Here is the reply,
Dennis,
The North campgrounds will be closed from June 9 thru June 15. Reservations have been cut off for all campgrounds from June 6 thru June 16. The entire riding area of the dunes will be closed to all riders on June 12, 13, and 14.
I hope this helps in planning your trip to Little Sahara a little easier.
Thanks for your interest in our park!