Performances will begin at 11 PM for the once-a-month events.
Hope, who will appear June 19, was most recently seen playing Eponine in Les Miserables at the Queens Theatre. She previously made her professional debut as Dorothy in The Wizard of Oz, after winning the BBC's "Over the Rainbow" TV contest for the role. She will next play Cathy in Jason Robert Brown's The Last Five Years at Greenwich Theatre and Brighton's Warren Theatre.
Riding, who will appear July 31, is currently reprising her role as Babe Williams in the West End transfer of The Pajama Game to the Shaftesbury Theatre that she originated at Chichester's Minerva Theatre last year. She has won Olivier Awards for her performances as Julie Jordan in Carousel and Eliza Doolittle in My Fair Lady. She has also been seen at the National in Guys and Dolls, A Little Night Music and Oh! What A Lovely War. Other West End credits include Blithe Spirit, Billy Elliot, The Witches of Eastwick, The Umbrellas of Cherbourg and, most recently, Stephen Ward.
Boys, who will appear Aug. 28, was a competitor in BBC's "Any Dream Will Do" in 2007 to play the role of Joseph in Joseph and the Amazing Technicolor Dreamcoat, but lost to Lee Mead. His West End credits include Sir Lancelot in Spamalot at the Playhouse Theatre, Avenue Q at the Noel Coward and Gielgud Theatres, Grease at the Victoria Palace and Rent at the Prince of Wales. He has also appeared in Ordinary Days and Wolfboy at Trafalgar Studios 2. Regional and European credits include tours of High Society, The War of the Worlds, West Side Story and Sunset Boulevard.
To book tickets contact the box office on 0844 482 5110 or visit www.delfontmakintosh.co.uk.