I like your people watch idea. Currently the town goes through 5 main weight gain stages (plus a sixth obesified state that only changes the flavour text in the local news).
Every location in town (other than the doughnut shop which has a single description per stage and the train station which has no description) has a pool of 5 random events that are specific to the current weight stage & show the changes to the townsfolk.
But the player is unlikely to see these events as they have little incentive to visit these locations. So in the next feature update, I think I'll add a people watch button to each location that cycles through the events, plus a notification when the town changes to a new weight stage, with a suggestion that the player visit the locations in town to see the fruits of their labour.