The point that was made about friends of friends showing up was a good one. We often think in terms of just friends and family showing up to our place in a time of disaster and then fighting off angry mobs and un prepared neighbors. When an invited friends dear Aunt so and so who lives down the road from them shows up with them what do you do? How do you handle it? Depending on the nature of the disasters it may be easy but if the disasters could last an indefinite amount of time, what then? Those are decisions that need to be thought about now and discussed. There may not be a right one but there will be a hard one and everyone on the invited list needs to be on the same page.