A new advisory regarding Disney's Hollywood Studios was posted just a few minutes ago:

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Disney’s Hollywood Studios will close tonight (Monday, Dec. 19) at 21:00 (9 p.m.). Please ensure [that everyone is] aware of the change and sharing the correct park hours since this change is not reflected in the  Times Guide.

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The park today was scheduled to close at 8:00 p.m., and will therefore remain open for an additional hour.