Ledisi, Adam Lambert Photo

From: Photo Flash: Get A Glimpse of the Magic at A VERY WICKED HALLOWEEN with Idina Menzel, Kristin Chenoweth, Ariana Grande And More!

To celebrate 'Wicked's' 15th anniversary on Broadway, NBC will throw a joyous Halloween party for the ages. This televised concert featuring songs from the blockbuster musical hit 'Wicked' will showcase a cavalcade of special guest stars to help celebrate the music and the magic of the show that tells the story of what happened in Oz before Dorothy dropped in.  Check out advance photos from the special below!