No, start car every once in a while or don't worry about it, the staff will jump your car if battery goes dead.
Last week someone had their truck running the whole show. It was very disturbing to trying to hear the movie. I agree with not using the car fan, but the radio should be OK with your battery. :)
Radio is fine, just be careful not to run the car fan
They have a quick start that you can request from concession strand
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