Today is Good Friday, the day Catholics and Mainline Protestants commemorate the death of Jesus.
Good Friday is always the Friday before Easter, which is the first Sunday after the first full moon after the vernal equinox.
Why is an explicitly Christian holiday a day off in a business that’s famously run by Jews? I have no idea. I guess the Elders of Zion decided to cut us shiksas and shegetzes a break for once.2 A break they didn’t give themselves, by the way. None of the Jewish holidays are union holidays (although I have noticed many people aren’t in the office on those days).
I’m honestly not sure when or how the union holidays were established; most people I know in the business today have no idea what Good Friday is supposed to mean.
Speaking of Jews and Hollywood, you should read An Empire of Their Own: How the Jews Invented Hollywood. It’s pretty much exactly what the title says: the story of how a bunch of immigrants traveled out west, and created not just an industry, but a new art form, more or less from scratch.