I have never seen anyone watching movies on the Poly beach at night. Doesn't mean it hasn't happened, just that I've never seen it. My guess is "no" but I'm not 100% certain.
This past December when I stayed at the Polynesian there were no movies that were shown on the beach and I also think this happens at the SAB pool for guests of the Yacht & Beach Club Resorts.
Maybe you are thinking of the Electric Water Pageant? That is a parade of boats with light-up figures on the boats and goes past the Poly. I have not seen any movies at Poly on the beach, and they are not mentioned on Tikiman's very comprehensive website, so I'm guessing probably not.
I think I remember something like that way back in the late seventies/early eighties. That was when the only resorts on property were the poly, contemporary/ and fort along with three at the hotel plaza. But that was a real long time ago. They used to have church serices there in lua cove on sundays also. That is also now a thing of the past.
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