How can one prepare for a power grid shutdown? What are all the things a person should get ahead of time?

like a planned power grid shutdown scheduled for a specific time? make sure laptop and phone are fully charged. make sure game consoles are turned off. know in advance what you're gonna eat ( eat before it happens, have a barbacue, go to a restaurant outside of the shutdown zone, turn to canibalism). if you live in a very cold area and have only electric heating you might want to go crash at a friends or family or rent a hotel room.