I think there's a good number of folks on the west coast/Pacific Northwest who take great care of their D's.
As far as location, Vegas makes no sense unless it was mid- November when it's semi-bearable heat-wise. DeLoreans in the hot sun are like ovens, so the desert and heat of Las Vegas loses me.
If we had a west coast show that's central, the best spot would be something like Monterey (where they have lots of car shows) or Pismo Beach. Those are both pretty reasonable drives for both Washington state and SoCal owners. And lovely vacation spots to boot.