Cynthia Erivo and Ariana Grande will lead a one-time-only “WICKED” special event from the Peacock Theater in Los Angeles this fall. Erivo and Grande will be joined by their co-stars and other surprise guests to perform many songs from the first movie — and maybe, just maybe, a little bit from the upcoming “WICKED: FOR GOOD” as well — for a special that will air exclusively on N...