In what state did Olivia Newton-John perform Summer Nights? 
Summer Nights (residency show): Summer Nights is the debut residency show by Australian recording artist, Olivia Newton-John. Summer Nights (residency show):  The show takes place in the Donny & Marie Showroom, at the Flamingo Las Vegas. Flamingo Las Vegas: Flamingo Las Vegas (formerly The Fabulous Flamingo and Flamingo Hilton Las Vegas) is a hotel and casino located on the Las Vegas Strip in Paradise, Nevada.
Nevada