Olivia was at the Flamingo Hotel in Las Vegas for an extended residency performing her greatest hits, a return to the city where she opened for Charlie Rich in 1974
I'm not quire sure what a good girl like Sandy is doing arriving in the bad guys' car. I guess Danny did win the pink slips for Hell's Chariot at Thunder Road by beating Craterface, so if Sandy wants to arrive in it 36 years later then she can if Danny gave her the OK.