We ourselves feel that what we are doing is just a drop in the ocean. But the ocean would be less because of that missing drop.
These rooms are decorated in two days. It's all kept secret. The neighbors spend the night in each other's home. They don't see their finished room until the end of the second day. They have no say what happens in their own home.
I don't know much about Americanism, but it's a damn good word with which to carry an election.