Factual error: The "big giveaway" that happens at 9pm across the whole country would have to happen at least five different consecutive times due to time zones. The "big giveaway" in the most eastern time zone would be successful, but further west it would be earlier than 9pm.

Halloween III: Season of the Witch (1982)
Ending / spoiler
Directed by: Tommy Lee Wallace
Starring: Dan O'Herlihy, Tom Atkins, Michael Currie, Stacey Nelkin
The doctor manages to escape the strange town. The girl dies and a robot takes her place but the doctor manages to destroy the girl robot. The doctor manages to have the major networks stop the broadcast of the silver shamrock commercial but the movie closes with one station still broadcasting and he is unable to stop it.
Bill Bergquist
Conal Cochran: It will be morning soon. Halloween morning. A very busy day for me.
Trivia: Spoilers: Originally, the credits were going to be accompanied by the sound of wailing cries of children, implying that Cochran's plan worked. However, it was later decided to instead simply play the movie's theme over the credits to leave the ending more ambiguous, so that the audience will never know for sure whether or not Challis stopped Cochran's plans.
Question: I could be wrong, but wouldn't destroying the Silver Shemrock factory disable the commercial and/or the mask chips?
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Chosen answer: They don't broadcast the commercial, the cable company does. And the mask chips all have tiny pieces of the rock inside, so they will still work regardless of whether or not the factory is destroyed. So the answer is "no" and "no."