Tennis star Andre Agassi has announced the scheduled performers for his Fourth Annual Grand Slam for Children show on Sat., Sept. 26. Mick Fleetwood, David Foster, Dennis Miller, Stevie Nicks, Lionel Ritchie and Robin Williams have all committed to participate in the concert benefit and related events, which will take place at the Las Vegas MGM Grand Garden Arena. The event will also feature a black-tie dinner and auction, where attendees can bid on a dinner with Robin Williams and Bill Cosby's custom-designed Infiniti Q45. The event benefits the Andre Agassi Charitable Foundation, which supports various organizations that assist at-risk children in Agassi's hometown of Las Vegas.