Lovely! I am all for an offline day in the year where everybody does what you described.
Plenty of these experiences can be found without disconnecting the electricity for multiple countries. Personally, I find musical events of all sorts are amazing for this, and completely AI free should you chose the right events :)
This weekend Liquicity came to Barcelona (for the first time?) and being with other strangers, dancing all night long, to other humans playing us music and singing and sometimes fucking up, is just an experience out of this world, and these sort of events are all around us, almost every week or at least every month. If not in your country, probably in your neighboring country, just a bus/train ride away.
You just need to take the steps and get out of your house, the human connections are out there and ready to be grabbed by the ones who dare and persist :)
Let's do it today
I forget where, but there was a restaurant who locked all phones in a box at your table and if you made it to the end without opening it the table got a free cookie.