Sand Drags at Gordons Well
One of my favorite things to do in the dunes (besides riding) is watching the sand drags. There you'll find just about everything from golf carts to high performance sand rails doing wheelies and kicking up rooster tails. This event (which usually happens a few hours before dark on most weekends) draws as big a crowd as you're likely to find at one single event at the dunes, except maybe the hill climbs over at Glamis' Competition Hill or Olds.
It's dusty and loud, but worth every minute of it.