Buckley, who will appear on June 23, received the Tony Award for her work in Cats and starred in such Broadway musicals as 1776, Pippin, Triumph of Love, Carrie and Sunset Boulevard. She will appear at New York City's Town Hall on Saturday, October 20 as part of the The Third Annual Broadway Cabaret Festival.
Cook, who will appear on July 7, received the Tony Award for her work in The Music Man. Her many other Broadway credits include Flahooley, Plain and Fancy, Carousel, The Gay Life, and She Loves Me. Cook will appear later this month at the Kennedy Center in Washington, D.C.
Lawrence received a Tony nomination for her work in West Side Story. Her other Broadway credits include Subways Are for Sleeping, I Do! I Do! and Kiss of the Spiderwoman.
For tickets and other information, call 847-266-5100 or visit www.ravinia.org.