Spain? check guifi.net ;)
People had LAN Partys playing video games “offline” in the 90s… Setting up a network is easy, the difficulty comes from scaling up to many nodes, and spreading through the geography (e.g. if you were to use antennas for WLAN, they would need a mostly unobstructed vision) which in urban areas gets tricky.
But those “topology” issues can be flattened, e.g. you can always have a raspberry pi (or any device) acting as server in the corner of a neighborhood. A virtual bulletin board, emails, etc. all could be self-hosted locally there and then people could go grab a coffee and consume the local news just like in the middle ages, but with a screen, digital assets and some healthy amount of trolling :P
+1 I use it to on all of my devices for sharing 1 folder, just set one as introducer, and keep adding nodes (e.g. phone, Work mini, laptops, PC, …) Once you have that set, start adding folders as needed for specific cases (e.g. a folder shared among all mentioned except for Work mini.)