Me and my friends have been discussing Z-Day in our art class at school since the beginning of the year, so heres wat we got:
Meet at our main rally point which is house one. We all live really close and are in a relatively small rural town in Oklahoma. From there we gear up, group up, and haul over to the castle by my house. (it is actually built like a castle and out in the farm areas so its relatively isolated and pretty secure). From there we devise a plan for the exaact scenario, rescue teams, clean-up teams, PSD (personal security detail), etc.
Honestly I'd check the news and call the cops to see if it was real. If I got anything but a "No it was faked by someone on that freq." i'd hit walmart for survival gear I might need and still not have yet. If that were not possible I'd bunker down as best I could.