I can’t help but imagine some entertainers, by hearing the sound made by the “plazas” when you select them. A sound of someone playing music while people around walk and talk. Something that would make the town feel really “alive” and with vibrant culture.
No idea how this can be implemented specifically, but having street entertainments and perhaps some recurrent street festivals would be nice. You’d need at least one “large plaza” to be built in your town to make them available. Maybe adding a new profession for it too, and make it “improve” by building a special “drama/music school” for it. These festivals/entertainers would give a temporary happiness boost.