Hats off to Steve Wynn.
The hotel developer had a surprise up his sleeve on Monday when 800 invited guests arrived at the Encore Theater.
A big clue came when black hats were handed out at the door.
But Wynn kept his surprise under hat until country legend Garth Brooks walked on stage and performed a concert.
Among the celebrities in the crowd: Bette Midler, Rita Rudner, Steve Lawrence and Eydie Gorme,
"I’m still not sure why we were there, but it was a great show," an attendee told Vegas Confidential.
–NORM CLARKE, Vegas Confidential