Linda Ronstadt called Moore a “great American patriot” and “someone who is spreading the truth.” She also encouraged the audience at the Aladdin hotel-casino to see the documentary about President Bush.
"Ronstadt’s comments drew loud boos, and some of the 4,500 people in attendance stormed out of the theater. People also tore down concert posters and tossed cocktails into the air."
“It was a very ugly scene,” Aladdin President Bill Timmins said. “She praised him and all of a sudden all bedlam broke loose.” Timmins booted her out, wouldn’t even let her back into her dressing room and had her escorted off the property. Michael Moore then called Timmins (who is British) "un-American."
This story on the issue has some more detail.