Hi,
Yom Kippur sitting happens all around the streets of the big cities. People takes out plastic chairs, tables, sofas, armchairs, etc and making the streets to be their living room.
Old people used to say this is how Friday night used to be. If not in the big cities at least in the Kibbutz and small settlements. There was no TV or Internet to spends your time on Friday night in. People went out, set and talk with each other.
In the morning you can say this intersection was a living room as the furniture is still there. I guess people does think it is their living room as they leave the furniture on the street, making it hard for emergency vehicles to drive through it.
Plastic Keter chairs are used in many Israeli brawls, especially around swimming pools. Those are the most common plastic chairs in Israel, so it does make sense if someone use a plastic chair in a brawl, it will be a plastic Keter chair.
At first look, the intersection, full of those plastic Keter chairs, looked like a scene of a massive Israeli brawl. But it is Yom Kippur, when we should ask for forgiveness and give it to others. And looking out for more reasons for brawls.
For me sitting down on the streets with my neighbors from our building, did helped me pass the fast more quickly. We were sitting as the kids were cycling up and down the streets (Mindal has just managed to take control on her bikes couple of weeks ago 
, just on time).
Take Care
Gad
An intersection in Ramat Gan, full of furniture in the morning after Yom Kippur sitting. Might also be a scene of an Israeli swimming pool brawl with all those plastic Keter chairs all around it.