April 21, 1977:
After 15 previews, the musical Annie opened at the Alvin Theatre.
The show would run for 2377 performances on Broadway before closing in 1983.
If you're a fan of the show, you might also enjoy the documentary about growing up as part of the cast of the Broadway and touring productions: Life After Tomorrow.
The trailer makes it appear a bit more ominous than it really is.