It’s no longer online in order to minimize data exposure, but during some major wildfires a decade ago, a small city was evacuated with my city being the nearest safe place to be (~4 hours away), so I built a site within a couple of hours to let people with spare rooms offer space to evacuees. For nearly a week I became the place to find vetted information about resources for everything an evacuee needed to know. It took the province and Red Cross 4-5 days to get their systems up and running so I was an important stop gap. I’ve since devised a system for evacuee information that I can deploy in less than an hour (it’s always running, but I confirm data for each deployment to make sure links and phone numbers are still valid).