This is why I tell everyone who'll listen that if you want to prep for a disaster, step 0 is to hold a block party. Most people don't even know their neighbor's names!
Also worked for me joining my local volunteer fire company. I spend like an hour a week going on a few calls and then hang around shooting the shit. Six months later, I know the mayor and half the city council. I've met like half the town and people wave at me all the time. It's great, even got to save an old woman's house from burning down the other day. I'm kicking myself for not getting into this sooner. Doubles as a great incentive to stay in shape. If nothing else at least a few times a week I'm doing some sprinting when I hear the horn.
Works for CrossFit too, often it's a great way to make friends.