Keep it in its case unless you're playing it of course & everytime you finish playing, spray it down good with some of that compressed air they got for computers. You'll want a few cans of that, it works great.
Did that exact thing for the turntables & mixer, even after some thick dust rolled thru & they're perfectly preserved. After ever record change, a quick blast of air saved the vinyl a lot too.
Even when packing up you can use it on chairs & such if you're that worried about excess dust. We had a designated "air bitch" while packing up last time & were glad we did when taking all that stuff back out at home.
Have fun & thank you for bringing more 'traditional' instruments to the playa!