You didn't understand me.
Let me explain again. Super Penguin got his information from a magazine scan that was shown recently. It showed a picture of the mayor planting a sapling for the large tree that is shown on the front cover and conception map. Information was found that said that at the start of the game the town tree is planted to mark the occasion of the new mayor and the that the tree will grow as the town grows. The reason why there was villagers surrounding the planting of the tree is because this is an important event being held in the tutorial at the start of the game. The reason I suspected that this event will only be held for other important events such as the planting of the town tree is because as SP said: It would be crazy to have a gathering for every time you put in a new bench. - This means he thinks like I do that a gathering won't be held for every new furniture. Don't get me wrong, they might have gatherings for the first few outdoor furniture items, but I suspect it won't be that way for the whole game as SP describes that that would be: 'annoying'.
I hope you get what I mean now and as everyone is more than often, I could be wrong.
Edit - I understand he also found pictures of gatherings around bridges, but as SP says: bridges are a big deal. So I still go with my opinion.