Halloween at Glamis sand dunes has marked the beginning of desert season for the offroading community in southern California and Arizona for generations. OHVers flock to the Imperial Sand Dune Recreation Area (ISDRA) to ride ATVs, motorcycles and buggies of all types.
This year the Dune Tour Spooktacular will be held in the ISDRA behind the Glamis Beach Store on October 30th and 31st in Glamis, Ca. and 
The All-Terrain Vehicle Safety Institute (ASI) will be offering free ATV safety training courses at 9am and 1pm Friday and Saturday during the event.
The ASI provides very good ATV safety training and is especially good with children. They explain things in a way that helps kids understand how ATV safety works instead of just telling them to be safe by doing this or this.
Keep in mind while you're out there, the dunes are different every year. They can even change from day to day. When you are coming to the top of a dune, never go straight over unless you're there to jump and have a spotter. Otherwise you should cross while riding parallel to the ridge so you can see what's on the other side.