Donny and Marie at Flamingo Hotel and Casino Las Vegas. See Donny and Marie Osmond use their iconic musical talent to entertain audiences at the Flamingo Las Vegas. For the first time in almost 30 years, this brother and sister duo have teamed up to present a 90-minute musical extravaganza. Drinks are available for purchase at the venue. Book with us and Save 18%! Donny and Marie at Flamingo Hotel and Casino Las Vegas.