Why would you want to keep a map of which neighbors have outlets? That just turns a nice one-time favor into a list of who you can hit up for free power every year, and pretty soon people feel used instead of generous. If you really plan ahead, just rent the generator or ask the city about a permit for a temporary hookup so you're not leaning on whoever happens to live closest.

That Park Tool gauge catching on grime is such a common thing and nobody warns you about it. I had the same deal last spring where mine read 0.75 after maybe 400 miles and I almost dropped $60 on a cassette for no reason. Now I hit the links with degreaser and a rag before I even touch the gauge, takes two minutes. My question is what made you decide to pull the chain off completely versus just cleaning it on the bike? I've heard the off-the-bike method gives you a truer read since there's no tension, but I've never bothered because breaking and rejoining with a master link each time feels like extra wear on the link itself. Do you run a quick link or are you pinning it back every time?