Event movies used to be a hallmark of Sunday nights in May for the broadcast nets, but that hasn’t been the case for years now — at least until now.

NBC, which got back in the longform game in a big way in December with its live version of “The Sound of Music,” on Thursday announced that two-part movie “Rosemary’s Baby” will air on Sunday, May 11 and Thursday, May 15. It will air from 9-11 p.m. both days.

The net has struggled on Sunday and Thursday this spring, so it makes sense to plug two of the May sweep nights with the pic. The second night will go up against the “Grey’s Anatomy” season finale, which is expected to rate well with Sandra Oh’s exit.

“Rosemary’s Baby,” a four-hour adaptation of the 1967 bestselling suspense novel by Ira Levin, centers on a young married couple who move into a Paris apartment that has a haunted past. After getting pregnant, the wife becomes increasingly suspicious that both her husband and their neighbors will have ulterior motives when her child is born.

A theatrical version of “Rosemary’s Baby,” directed by Roman Polanski, came out in 1968.

The miniseries, from Lionsgate Television, stars Zoe Saldana, Patrick J. Adams, Jason Isaacs and Carole Bouquet.