Wait Til Dawn (1970)

On the night of a once in a millennia event, the convergence of a planetary alignment and a lunar eclipse, 6 friends gather together to have a viewing party to celebrate. As the eclipse nears its peak, the group prepares to head to the roof only to be stopped in their tracks when they all receive an emergency alert telling them not to look at the moon. A glance out the window at the streets below sees everyone outside all staring straight up, seemingly transfixed. As the night continues, the friends' minds and bodies are tattered and beaten by a powerful, enigmatic force. As they scramble to figure out what is happening they begin to come face to face with the realization that they only know one thing for sure, don't look at the moon.