About 15 years ago this happened https://en.wikipedia.org/wiki/Northeast_blackout_of_2003
I remember I was at the office designing and printing thermal tickets for a local festival and around 4:15 pm EDT the power went out.
After a couple of hours the boss got the generator from his home and connected the mail, DNS, database, radius and web servers.
We were back online and if people had power they could "dial-up" with our us (we were an ISP as well) and surf the web.
DSL was down as that required third party servers which were off site and they did not have power.
We stayed at the office until about 4 am EDT (maybe later) making sure that everything was working.
To pass the time we watched Old School (https://www.imdb.com/title/tt0302886/
) about three times, on a laptop,
pausing every now and then to get updates and to verify services were still working.
Finally the power came back on the boss and me each went home.
It was strange not having any light pollution in the middle of the night. The stars were easier to see.
I'm sure that there are a lot of interesting stories for those who experienced the event.