Yes. Be sure to cleanup after yourself and be courteous to others.
Yes you can
You definetly can sit outside your vehicle. Just make sure to clean up any mess you happen to make. I would also highly recommend bringing a portable FM radio as the drive in has its own radio station. While sitting outside of a vehicle the window speakers can be easily drowned out by the white noise of the open air.
Yes u can
We did no one said anything.. Just gotta keep area clean
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